diff --git a/MANUAL.md b/MANUAL.md
index cc63d7c9..12942b07 100644
--- a/MANUAL.md
+++ b/MANUAL.md
@@ -4429,6 +4429,41 @@ The most relevant clauses of IEEE1800-2017 are:
 
 
 
+* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+## Syntax Rule: `package_item_not_in_package`
+
+### Hint
+
+Place item into a package, module, interface, program, udp, or config.
+
+### Reason
+
+Globally-scoped items are not supported by some tools.
+
+### Pass Example (1 of 1)
+```systemverilog
+package P;
+  localparam int A = 1;
+endpackage
+```
+
+### Fail Example (1 of 1)
+```systemverilog
+localparam int A = 1;
+```
+
+### Explanation
+
+Some tools support items, like variables, nets, `task`, `function`, `class`,
+`localparam`, `covergroup`, etc. to be defined outside of a `package`,
+`module`, `program`, `interface` etc. which can lead to namespace issues.
+
+The most relevant clauses of IEEE1800-2017 are:
+- A.1.11 Package items
+
+
+
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 
 ## Syntax Rule: `parameter_default_value`
diff --git a/md/syntaxrules-explanation-package_item_not_in_package.md b/md/syntaxrules-explanation-package_item_not_in_package.md
new file mode 100644
index 00000000..17ee9304
--- /dev/null
+++ b/md/syntaxrules-explanation-package_item_not_in_package.md
@@ -0,0 +1,6 @@
+Some tools support items, like variables, nets, `task`, `function`, `class`,
+`localparam`, `covergroup`, etc. to be defined outside of a `package`,
+`module`, `program`, `interface` etc. which can lead to namespace issues.
+
+The most relevant clauses of IEEE1800-2017 are:
+- A.1.11 Package items
diff --git a/src/syntaxrules/package_item_not_in_package.rs b/src/syntaxrules/package_item_not_in_package.rs
new file mode 100644
index 00000000..9f5da352
--- /dev/null
+++ b/src/syntaxrules/package_item_not_in_package.rs
@@ -0,0 +1,60 @@
+use crate::config::ConfigOption;
+use crate::linter::{SyntaxRule, SyntaxRuleResult};
+use sv_parser::{NodeEvent, PackageItem, RefNode, SyntaxTree};
+
+#[derive(Default)]
+pub struct PackageItemNotUnderPackage {
+    under_package_declaration: bool,
+}
+
+impl SyntaxRule for PackageItemNotUnderPackage {
+    fn check(
+        &mut self,
+        _syntax_tree: &SyntaxTree,
+        event: &NodeEvent,
+        _option: &ConfigOption,
+    ) -> SyntaxRuleResult {
+        let node = match event {
+            NodeEvent::Enter(x) => {
+                match x {
+                    RefNode::PackageDeclaration(_) => {
+                        self.under_package_declaration = true;
+                    }
+                    _ => ()
+                }
+                x
+            }
+            NodeEvent::Leave(x) => {
+                match x {
+                    RefNode::PackageDeclaration(_) => {
+                        self.under_package_declaration = false;
+                    }
+                    _ => ()
+                }
+                return SyntaxRuleResult::Pass;
+            }
+        };
+
+        if self.under_package_declaration {
+            SyntaxRuleResult::Pass
+        } else {
+            match node {
+                RefNode::PackageItem(PackageItem::PackageOrGenerateItemDeclaration(_)) |
+                RefNode::PackageItem(PackageItem::PackageExportDeclaration(_)) => SyntaxRuleResult::Fail,
+                _ => SyntaxRuleResult::Pass
+            }
+        }
+    }
+
+    fn name(&self) -> String {
+        String::from("package_item_not_in_package")
+    }
+
+    fn hint(&self, _option: &ConfigOption) -> String {
+        String::from("Place item into a package, module, interface, program, udp, or config.")
+    }
+
+    fn reason(&self) -> String {
+        String::from("Globally-scoped items are not supported by some tools.")
+    }
+}
diff --git a/testcases/syntaxrules/fail/package_item_not_in_package.sv b/testcases/syntaxrules/fail/package_item_not_in_package.sv
new file mode 100644
index 00000000..45e3314c
--- /dev/null
+++ b/testcases/syntaxrules/fail/package_item_not_in_package.sv
@@ -0,0 +1 @@
+localparam int A = 1;
diff --git a/testcases/syntaxrules/pass/package_item_not_in_package.sv b/testcases/syntaxrules/pass/package_item_not_in_package.sv
new file mode 100644
index 00000000..35aa8477
--- /dev/null
+++ b/testcases/syntaxrules/pass/package_item_not_in_package.sv
@@ -0,0 +1,3 @@
+package P;
+  localparam int A = 1;
+endpackage