diff --git a/README.md b/README.md
index 421997a..218cf6b 100644
--- a/README.md
+++ b/README.md
@@ -42,13 +42,15 @@ require 'json' # For JSON.dump
 # API Initialization and configuration
 
 OpenFeature::SDK.configure do |config|
-    # your provider of choice
-    config.provider = OpenFeature::SDK::Provider::InMemoryProvider.new(
-      {
-        "flag1" => true,
-        "flag2" => 1
-      }
-    )
+  # your provider of choice, which will be used as the default provider
+  config.set_provider(OpenFeature::SDK::Provider::InMemoryProvider.new(
+    {
+      "flag1" => true,
+      "flag2" => 1
+    }
+  ))
+  # alternatively, you can bind multiple providers to different domains
+  config.set_provider(OpenFeature::SDK::Provider::NoOpProvider.new, domain: "legacy_flags")
 end
 
 # Create a client
diff --git a/lib/open_feature/sdk/api.rb b/lib/open_feature/sdk/api.rb
index e58198d..7ad7e2f 100644
--- a/lib/open_feature/sdk/api.rb
+++ b/lib/open_feature/sdk/api.rb
@@ -19,7 +19,7 @@ module SDK
     # To use the SDK, you can optionally configure a <tt>Provider</tt>, with <tt>Hook</tt>
     #
     #   OpenFeature::SDK::API.instance.configure do |config|
-    #     config.provider = NoOpProvider.new
+    #     config.set_provider NoOpProvider.new
     #   end
     #
     # If no provider is specified, the <tt>NoOpProvider</tt> is set as the default <tt>Provider</tt>.
@@ -30,7 +30,7 @@ class API
       include Singleton # Satisfies Flag Evaluation API Requirement 1.1.1
       extend Forwardable
 
-      def_delegators :configuration, :provider, :provider=, :hooks, :context
+      def_delegators :configuration, :provider, :set_provider, :hooks, :context
 
       def configuration
         @configuration ||= Configuration.new
diff --git a/lib/open_feature/sdk/configuration.rb b/lib/open_feature/sdk/configuration.rb
index ceed507..19e2c0a 100644
--- a/lib/open_feature/sdk/configuration.rb
+++ b/lib/open_feature/sdk/configuration.rb
@@ -14,24 +14,28 @@ class Configuration
       extend Forwardable
 
       attr_accessor :context, :hooks
-      attr_reader :provider
 
-      def_delegator :@provider, :metadata
+      def_delegator :provider, :metadata
 
       def initialize
         @hooks = []
+        @providers = {}
+      end
+
+      def provider(domain: nil)
+        @providers[domain]
       end
 
       # When switching providers, there are a few lifecycle methods that need to be taken care of.
       #   1. If a provider is already set, we need to call `shutdown` on it.
       #   2. On the new provider, call `init`.
       #   3. Finally, set the internal provider to the new provider
-      def provider=(provider)
-        @provider.shutdown if @provider.respond_to?(:shutdown)
+      def set_provider(provider, domain: nil)
+        @providers[domain].shutdown if @providers[domain].respond_to?(:shutdown)
 
         provider.init if provider.respond_to?(:init)
 
-        @provider = provider
+        @providers[domain] = provider
       end
     end
   end
diff --git a/lib/open_feature/sdk/provider/no_op_provider.rb b/lib/open_feature/sdk/provider/no_op_provider.rb
index c80118b..3939272 100644
--- a/lib/open_feature/sdk/provider/no_op_provider.rb
+++ b/lib/open_feature/sdk/provider/no_op_provider.rb
@@ -11,7 +11,7 @@ module Provider
       # To use <tt>NoOpProvider</tt>, it can be set during the configuration of the SDK
       #
       #   OpenFeature::SDK.configure do |config|
-      #     config.provider = NoOpProvider.new
+      #     config.set_provider NoOpProvider.new
       #   end
       #
       # Within the <tt>NoOpProvider</tt>, the following methods exist
diff --git a/spec/open_feature/sdk/api_spec.rb b/spec/open_feature/sdk/api_spec.rb
index f0163c0..1b3be34 100644
--- a/spec/open_feature/sdk/api_spec.rb
+++ b/spec/open_feature/sdk/api_spec.rb
@@ -10,7 +10,7 @@
   context "with Requirement 1.1.3" do
     before do
       api.configure do |config|
-        config.provider = OpenFeature::SDK::Provider::NoOpProvider.new
+        config.set_provider(OpenFeature::SDK::Provider::NoOpProvider.new)
         config.hooks << hook1
         config.hooks << hook2
       end
@@ -28,7 +28,7 @@
   context "with Requirement 1.1.4" do
     before do
       api.configure do |config|
-        config.provider = OpenFeature::SDK::Provider::NoOpProvider.new
+        config.set_provider(OpenFeature::SDK::Provider::NoOpProvider.new)
       end
     end
 
@@ -52,7 +52,7 @@
   context "with Requirement 1.1.5" do
     before do
       api.configure do |config|
-        config.provider = OpenFeature::SDK::Provider::NoOpProvider.new
+        config.set_provider(OpenFeature::SDK::Provider::NoOpProvider.new)
       end
 
       api.build_client(name: "requirement-1.1.5")
diff --git a/spec/open_feature/sdk/configuration_spec.rb b/spec/open_feature/sdk/configuration_spec.rb
index 8d98ddc..1d0eb4f 100644
--- a/spec/open_feature/sdk/configuration_spec.rb
+++ b/spec/open_feature/sdk/configuration_spec.rb
@@ -5,27 +5,38 @@
 RSpec.describe OpenFeature::SDK::Configuration do
   subject(:configuration) { described_class.new }
 
-  describe "#provider=" do
+  describe "#set_provider" do
     context "when provider has an init method" do
       let(:provider) { OpenFeature::SDK::Provider::InMemoryProvider.new }
 
       it "inits and sets the provider" do
         expect(provider).to receive(:init)
 
-        configuration.provider = provider
+        configuration.set_provider(provider)
 
         expect(configuration.provider).to be(provider)
       end
     end
 
     context "when provider does not have an init method" do
-      it "sets the provider" do
+      it "sets the default provider" do
         provider = OpenFeature::SDK::Provider::NoOpProvider.new
 
-        configuration.provider = provider
+        configuration.set_provider(provider)
 
         expect(configuration.provider).to be(provider)
       end
     end
+
+    context "when name is given" do
+      it "binds the provider to that name" do
+        provider = OpenFeature::SDK::Provider::InMemoryProvider.new
+        expect(provider).to receive(:init)
+
+        configuration.set_provider(provider, domain: "testing")
+
+        expect(configuration.provider(domain: "testing")).to be(provider)
+      end
+    end
   end
 end
diff --git a/spec/specification/flag_evaluation_api_spec.rb b/spec/specification/flag_evaluation_api_spec.rb
index 8f573fc..d76fa4e 100644
--- a/spec/specification/flag_evaluation_api_spec.rb
+++ b/spec/specification/flag_evaluation_api_spec.rb
@@ -14,7 +14,7 @@
       specify "the API must define a provider mutator" do
         provider = OpenFeature::SDK::Provider::NoOpProvider.new
 
-        OpenFeature::SDK.provider = provider
+        OpenFeature::SDK.set_provider(provider)
 
         expect(OpenFeature::SDK.provider).to be(provider)
       end
@@ -25,7 +25,7 @@
         provider = OpenFeature::SDK::Provider::InMemoryProvider.new
         expect(provider).to receive(:init)
 
-        OpenFeature::SDK.provider = provider
+        OpenFeature::SDK.set_provider(provider)
       end
     end
 
@@ -37,8 +37,32 @@
         expect(previous_provider).to receive(:shutdown)
         expect(new_provider).not_to receive(:shutdown)
 
-        OpenFeature::SDK.provider = previous_provider
-        OpenFeature::SDK.provider = new_provider
+        OpenFeature::SDK.set_provider(previous_provider)
+        OpenFeature::SDK.set_provider(new_provider)
+      end
+    end
+
+    context "Requirement 1.1.3" do
+      specify "the API must provide a function to bind a given provider to one or more client names" do
+        first_provider = OpenFeature::SDK::Provider::InMemoryProvider.new
+        second_provider = OpenFeature::SDK::Provider::InMemoryProvider.new
+
+        OpenFeature::SDK.set_provider(first_provider, domain: "first")
+        OpenFeature::SDK.set_provider(second_provider, domain: "second")
+
+        expect(OpenFeature::SDK.provider(domain: "first")).to be(first_provider)
+        expect(OpenFeature::SDK.provider(domain: "second")).to be(second_provider)
+      end
+
+      specify "if client name is already bound, it is overwritten" do
+        previous_provider = OpenFeature::SDK::Provider::InMemoryProvider.new
+        new_provider = OpenFeature::SDK::Provider::InMemoryProvider.new
+
+        OpenFeature::SDK.set_provider(previous_provider, domain: "testing")
+        expect(OpenFeature::SDK.provider(domain: "testing")).to be(previous_provider)
+
+        OpenFeature::SDK.set_provider(new_provider, domain: "testing")
+        expect(OpenFeature::SDK.provider(domain: "testing")).to be(new_provider)
       end
     end
   end