diff --git a/cms/__init__.py b/cms/__init__.py
index 8f17c113a9..375e83cceb 100644
--- a/cms/__init__.py
+++ b/cms/__init__.py
@@ -5,6 +5,7 @@
 # Copyright © 2010-2012 Stefano Maggiolo <s.maggiolo@gmail.com>
 # Copyright © 2010-2012 Matteo Boscariol <boscarim@hotmail.com>
 # Copyright © 2013-2014 Luca Wehrstedt <luca.wehrstedt@gmail.com>
+# Copyright © 2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -33,6 +34,7 @@
     "TOKEN_MODE_DISABLED", "TOKEN_MODE_FINITE", "TOKEN_MODE_INFINITE",
     "TOKEN_MODE_MIXED",
     "FEEDBACK_LEVEL_FULL", "FEEDBACK_LEVEL_RESTRICTED",
+    "PARTICIPATION_LOCATION_ONSITE", "PARTICIPATION_LOCATION_REMOTE",
     # log
     # Nothing intended for external use, no need to advertise anything.
     # conf
@@ -69,6 +71,11 @@
 # can be omitted).
 FEEDBACK_LEVEL_RESTRICTED = "restricted"
 
+# Participation location
+
+PARTICIPATION_LOCATION_ONSITE = "onsite"
+PARTICIPATION_LOCATION_REMOTE = "remote"
+
 
 from .conf import Address, ServiceCoord, ConfigError, async_config, config
 from .util import mkdir, rmtree, utf8_decoder, get_safe_shard, \
diff --git a/cms/conf.py b/cms/conf.py
index e928243051..b0391dff7c 100644
--- a/cms/conf.py
+++ b/cms/conf.py
@@ -159,6 +159,7 @@ def __init__(self):
         self.teacher_login_kind = "district"  # "district" or "school"
         self.teacher_allow_impersonate = False
         self.teacher_show_results = True
+        self.teacher_enable_participation_locations = False
         self.teacher_show_task_statements = "never"  # "never", "after_start" or "always"
         self.teacher_allow_registration = False
         self.teacher_registration_anonymous = False
diff --git a/cms/db/user.py b/cms/db/user.py
index c98e97708f..ace5689c43 100644
--- a/cms/db/user.py
+++ b/cms/db/user.py
@@ -5,7 +5,7 @@
 # Copyright © 2010-2018 Stefano Maggiolo <s.maggiolo@gmail.com>
 # Copyright © 2010-2012 Matteo Boscariol <boscarim@hotmail.com>
 # Copyright © 2012-2018 Luca Wehrstedt <luca.wehrstedt@gmail.com>
-# Copyright © 2014-2016 Vytis Banaitis <vytis.banaitis@gmail.com>
+# Copyright © 2014-2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 # Copyright © 2015 William Di Luigi <williamdiluigi@gmail.com>
 # Copyright © 2016 Myungwoo Chun <mc.tamaki@gmail.com>
 #
@@ -33,8 +33,9 @@
 from sqlalchemy.schema import Column, ForeignKey, CheckConstraint, \
     UniqueConstraint
 from sqlalchemy.types import Boolean, Integer, String, Unicode, DateTime, \
-    Interval
+    Interval, Enum
 
+from cms import PARTICIPATION_LOCATION_ONSITE, PARTICIPATION_LOCATION_REMOTE
 from cmscommon.crypto import generate_random_password, build_password
 from . import CastingArray, Codename, Base, Admin, Contest, District, School
 
@@ -234,6 +235,12 @@ class Participation(Base):
         nullable=False,
         default=False)
 
+    # Where the user is participating from and how supervised they are.
+    location = Column(
+        Enum(PARTICIPATION_LOCATION_ONSITE, PARTICIPATION_LOCATION_REMOTE,
+             name="participation_location"),
+        nullable=True)
+
     # An unrestricted participation (e.g. contest time,
     # maximum number of submissions, minimum interval between submissions,
     # maximum number of user tests, minimum interval between user tests),
diff --git a/cms/locale/cms.pot b/cms/locale/cms.pot
index 9c27783960..606afd55e4 100644
--- a/cms/locale/cms.pot
+++ b/cms/locale/cms.pot
@@ -1145,3 +1145,12 @@ msgid ""
 "email address. After receiving confirmation we will send details to your "
 "email address."
 msgstr ""
+
+msgid "Participation location"
+msgstr ""
+
+msgid "On-site"
+msgstr ""
+
+msgid "Remote"
+msgstr ""
diff --git a/cms/locale/lt/LC_MESSAGES/cms.po b/cms/locale/lt/LC_MESSAGES/cms.po
index 936a1b3931..becdb7cb87 100644
--- a/cms/locale/lt/LC_MESSAGES/cms.po
+++ b/cms/locale/lt/LC_MESSAGES/cms.po
@@ -1222,3 +1222,12 @@ msgstr ""
 "el. paštą. Tokiu atveju į mokyklos oficialų el. paštą išsiųsime prašymą "
 "patvirtinti pageidaujamą el. paštą. Tik sulaukę patvirtinimo, galėsime "
 "siųsti informaciją į pageidaujamą el. paštą."
+
+msgid "Participation location"
+msgstr "Sprendimo vieta"
+
+msgid "On-site"
+msgstr "Mokykla"
+
+msgid "Remote"
+msgstr "Namai"
diff --git a/cms/server/admin/handlers/contestuser.py b/cms/server/admin/handlers/contestuser.py
index 1706ce8f50..8f91dbe125 100644
--- a/cms/server/admin/handlers/contestuser.py
+++ b/cms/server/admin/handlers/contestuser.py
@@ -11,6 +11,7 @@
 # Copyright © 2016 Myungwoo Chun <mc.tamaki@gmail.com>
 # Copyright © 2016 Peyman Jabbarzade Ganje <peyman.jabarzade@gmail.com>
 # Copyright © 2017 Valentin Rosca <rosca.valentin2012@gmail.com>
+# Copyright © 2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -218,6 +219,7 @@ def post(self, contest_id, user_id):
             self.get_timedelta_sec(attrs, "extra_time")
             self.get_bool(attrs, "hidden")
             self.get_bool(attrs, "unrestricted")
+            self.get_string(attrs, "location", empty=None)
 
             # Update the participation.
             participation.set_attrs(attrs)
diff --git a/cms/server/admin/templates/participation.html b/cms/server/admin/templates/participation.html
index f4e5e22eee..62fc2c3a6f 100644
--- a/cms/server/admin/templates/participation.html
+++ b/cms/server/admin/templates/participation.html
@@ -135,6 +135,19 @@ <h2 id="title_participation_info" class="toggling_on">Participation information<
         </td>
         <td><input type="text" name="extra_time" value="{{ participation.extra_time.total_seconds()|int }}"></td>
       </tr>
+      <tr>
+        <td>
+          <span class="info" title="Where the user is participating from and how supervised they are."></span>
+          Participation location
+        </td>
+        <td>
+          <select name="location">
+            <option value="" {% if participation.location is none %}selected{% endif %}></option>
+            <option value="{{ PARTICIPATION_LOCATION_ONSITE }}" {% if participation.location == PARTICIPATION_LOCATION_ONSITE %}selected{% endif %}>On-site</option>
+            <option value="{{ PARTICIPATION_LOCATION_REMOTE }}" {% if participation.location == PARTICIPATION_LOCATION_REMOTE %}selected{% endif %}>Remote</option>
+          </select>
+        </td>
+      </tr>
     </table>
     <input type="submit" value="Update" />
     <input type="reset" value="Reset" />
diff --git a/cms/server/jinja2_toolbox.py b/cms/server/jinja2_toolbox.py
index 707daec0ad..28dee9e4c7 100644
--- a/cms/server/jinja2_toolbox.py
+++ b/cms/server/jinja2_toolbox.py
@@ -3,6 +3,7 @@
 # Contest Management System - http://cms-dev.github.io/
 # Copyright © 2018 Luca Wehrstedt <luca.wehrstedt@gmail.com>
 # Copyright © 2018 Stefano Maggiolo <s.maggiolo@gmail.com>
+# Copyright © 2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -28,7 +29,8 @@
     contextfunction, environmentfunction
 
 from cms import TOKEN_MODE_DISABLED, TOKEN_MODE_FINITE, TOKEN_MODE_INFINITE, \
-    TOKEN_MODE_MIXED, FEEDBACK_LEVEL_FULL, FEEDBACK_LEVEL_RESTRICTED
+    TOKEN_MODE_MIXED, FEEDBACK_LEVEL_FULL, FEEDBACK_LEVEL_RESTRICTED, \
+    PARTICIPATION_LOCATION_ONSITE, PARTICIPATION_LOCATION_REMOTE
 from cms.db import SubmissionResult, UserTestResult
 from cms.grading import format_status_text
 from cms.grading.languagemanager import get_language
@@ -152,6 +154,9 @@ def instrument_generic_toolbox(env):
     env.globals["FEEDBACK_LEVEL_FULL"] = FEEDBACK_LEVEL_FULL
     env.globals["FEEDBACK_LEVEL_RESTRICTED"] = FEEDBACK_LEVEL_RESTRICTED
 
+    env.globals["PARTICIPATION_LOCATION_ONSITE"] = PARTICIPATION_LOCATION_ONSITE
+    env.globals["PARTICIPATION_LOCATION_REMOTE"] = PARTICIPATION_LOCATION_REMOTE
+
     env.filters["all"] = all_
     env.filters["any"] = any_
     env.filters["dictselect"] = dictselect
diff --git a/cms/server/teacher/handlers/__init__.py b/cms/server/teacher/handlers/__init__.py
index 71a82ea444..52ece3560f 100644
--- a/cms/server/teacher/handlers/__init__.py
+++ b/cms/server/teacher/handlers/__init__.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 # Contest Management System - http://cms-dev.github.io/
-# Copyright © 2014-2020 Vytis Banaitis <vytis.banaitis@gmail.com>
+# Copyright © 2014-2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -26,6 +26,7 @@
     TaskStatementHandler, \
     TaskAttachmentHandler, \
     ContestAttachmentHandler, \
+    ContestantLocationHandler, \
     ImpersonateHandler
 
 
@@ -40,6 +41,7 @@
     (r"/contest/([0-9]+)/task/(.+)/attachment/(.+)", TaskAttachmentHandler),
     (r"/contest/([0-9]+)/attachment/(.+)", ContestAttachmentHandler),
     (r"/impersonate/([0-9]+)", ImpersonateHandler),
+    (r"/participation_location/([0-9]+)", ContestantLocationHandler),
 ]
 
 
diff --git a/cms/server/teacher/handlers/contest.py b/cms/server/teacher/handlers/contest.py
index 955fe3c65b..f3c12a4633 100644
--- a/cms/server/teacher/handlers/contest.py
+++ b/cms/server/teacher/handlers/contest.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 # Contest Management System - http://cms-dev.github.io/
-# Copyright © 2014-2020 Vytis Banaitis <vytis.banaitis@gmail.com>
+# Copyright © 2014-2022 Vytis Banaitis <vytis.banaitis@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -32,7 +32,7 @@
     import tornado.web as tornado_web
 from sqlalchemy.orm import contains_eager, joinedload, subqueryload
 
-from cms import config
+from cms import config, PARTICIPATION_LOCATION_ONSITE, PARTICIPATION_LOCATION_REMOTE
 from cms.db import Contest, Participation, Task, User
 from cms.grading.scoring import task_score
 from cms.server import FileHandlerMixin
@@ -161,6 +161,13 @@ def get(self, contest_id, format="online"):
             self.r_params["header"] = header
             self.r_params["table"] = table
             self.r_params["allow_impersonate"] = config.teacher_allow_impersonate
+            self.r_params["enable_participation_location"] = (
+                config.teacher_enable_participation_locations
+            )
+            self.r_params["enable_participation_location_edit"] = (
+                config.teacher_enable_participation_locations and
+                contest.phase(self.timestamp) <= 0
+            )
             self.render("contest.html", **self.r_params)
 
 
@@ -243,6 +250,49 @@ def get(self, contest_id, filename):
         self.fetch(attachment, mimetype, filename)
 
 
+class ContestantLocationHandler(BaseHandler):
+    """Set contestant participation location.
+
+    """
+    @tornado_web.authenticated
+    def post(self, participation_id):
+        if not config.teacher_enable_participation_locations:
+            raise tornado_web.HTTPError(403)
+
+        p = Participation.get_from_id(participation_id, self.sql_session)
+        if p is None:
+            raise tornado_web.HTTPError(404)
+        if (p.contest_id not in config.teacher_active_contests or
+                userattr(p.user) != self.current_user):
+            raise tornado_web.HTTPError(403)
+
+        return_url = self.url("contest", p.contest.id)
+
+        if p.contest.phase(self.timestamp) > 0:
+            return self.redirect(return_url)
+
+        location = self.get_argument("location", "")
+        if location not in (PARTICIPATION_LOCATION_ONSITE, PARTICIPATION_LOCATION_REMOTE):
+            raise tornado_web.HTTPError(400)
+
+        try:
+            ip_address = ipaddress.ip_address(self.request.remote_ip)
+        except ValueError:
+            logger.warning("Invalid IP address provided by Tornado: %s",
+                           self.request.remote_ip)
+            return None
+
+        p.location = location
+        logger.info("Teacher set location to %s for contestant %r on contest %s, "
+                    "from IP address %s, at %s.",
+                    location, p.user.username, p.contest.name, ip_address,
+                    self.timestamp)
+
+        self.sql_session.commit()
+
+        return self.redirect(return_url)
+
+
 class ImpersonateHandler(BaseHandler):
     """Impersonate a contestant.
 
diff --git a/cms/server/teacher/templates/contest.html b/cms/server/teacher/templates/contest.html
index 6ab8894293..0ad6e1eb30 100644
--- a/cms/server/teacher/templates/contest.html
+++ b/cms/server/teacher/templates/contest.html
@@ -65,6 +65,9 @@ <h3>{% trans %}Attachments{% endtrans %}</h3>
       {% for head in header %}
       <th>{{ head }}</th>
       {% endfor %}
+      {% if enable_participation_location %}
+      <th style="width: 1%">{% trans %}Participation location{% endtrans %}</th>
+      {% endif %}
       {% if allow_impersonate %}
       <th style="width: 1%"></th>
       {% endif %}
@@ -76,6 +79,23 @@ <h3>{% trans %}Attachments{% endtrans %}</h3>
       {% for item in row %}
       <td>{{ item }}</td>
       {% endfor %}
+      {% if enable_participation_location %}
+      <td style="white-space: nowrap">
+        {% if enable_participation_location_edit %}
+        <form class="form-horizontal" style="margin: 0" enctype="multipart/form-data" action="{{ url("participation_location", p.id) }}" method="POST">
+          {{ xsrf_form_html|safe }}
+          <button type="{% if p.location == PARTICIPATION_LOCATION_ONSITE %}button{% else %}submit{% endif %}" name="location" value="onsite" class="btn{% if p.location == PARTICIPATION_LOCATION_ONSITE %} active{% endif %}">{% trans %}On-site{% endtrans %}</button>
+          <button type="{% if p.location == PARTICIPATION_LOCATION_REMOTE %}button{% else %}submit{% endif %}" name="location" value="remote" class="btn{% if p.location == PARTICIPATION_LOCATION_REMOTE %} active{% endif %}">{% trans %}Remote{% endtrans %}</button>
+        </form>
+        {% else %}
+          {% if p.location == PARTICIPATION_LOCATION_ONSITE %}
+            {% trans %}On-site{% endtrans %}
+          {% elif p.location == PARTICIPATION_LOCATION_REMOTE %}
+            {% trans %}Remote{% endtrans %}
+          {% endif %}
+        {% endif %}
+      </td>
+      {% endif %}
       {% if allow_impersonate %}
       <td style="white-space: nowrap"><a href="{{ url("impersonate", p.id) }}" class="btn" target="_blank">{% trans %}Log in as contestant{% endtrans %}</a></td>
       {% endif %}
diff --git a/config/cms.conf.sample b/config/cms.conf.sample
index 9dd69f0029..f810cf0ac6 100644
--- a/config/cms.conf.sample
+++ b/config/cms.conf.sample
@@ -181,6 +181,10 @@
     "_help": "Whether to show contestants' results to teachers.",
     "teacher_show_results": true,
 
+    "_help": "Whether to allow teachers to set contestants' participation",
+    "_help": "location (on-site vs remote).",
+    "teacher_enable_participation_locations": true,
+
     "_help": "Whether and when to allow teachers to download task statements",
     "_help": "and attachments. May be 'never', 'after_start', or 'always'.",
     "teacher_show_task_statements": "never",