diff --git a/reporting-app/app/services/member_oidc_provisioner.rb b/reporting-app/app/services/member_oidc_provisioner.rb
new file mode 100644
index 00000000..6480becb
--- /dev/null
+++ b/reporting-app/app/services/member_oidc_provisioner.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+# Provisions member user accounts from citizen IdP OIDC claims
+#
+# Creates or updates member users based on claims extracted from OIDC ID tokens.
+# Unlike StaffUserProvisioner, this does not use RoleMapper since members do not
+# have staff roles.
+#
+# Usage:
+#   provisioner = MemberOidcProvisioner.new
+#   user = provisioner.provision!(claims)
+#
+# Claims format:
+#   {
+#     uid: "unique-id-from-idp",
+#     email: "member@example.com",
+#     name: "John Smith"
+#   }
+#
+# Behavior:
+#   - Finds existing users by UID (not email) to handle email changes
+#   - Updates attributes (name, email) on every login
+#   - Does NOT set or change role (members have no staff role)
+#   - Sets mfa_preference to "opt_out" since IdP handles MFA
+#
+class MemberOidcProvisioner
+  PROVIDER = "member_oidc"
+
+  # Provision a member user from IdP claims
+  #
+  # @param claims [Hash] Claims extracted from OIDC ID token
+  # @option claims [String] :uid Unique identifier from IdP (required)
+  # @option claims [String] :email User's email address (required)
+  # @option claims [String] :name User's full name
+  # @return [User] The provisioned user record
+  # @raise [ArgumentError] If required claims (uid, email) are missing
+  # @raise [ActiveRecord::RecordInvalid] If user validation fails
+  def provision!(claims)
+    validate_claims!(claims)
+
+    user = find_or_initialize_user(claims[:uid], claims[:email])
+    sync_attributes(user, claims)
+    user.save!
+    user
+  end
+
+  private
+
+  def validate_claims!(claims)
+    raise ArgumentError, "claims cannot be nil" if claims.nil?
+    raise ArgumentError, "uid is required" if claims[:uid].blank?
+    raise ArgumentError, "email is required" if claims[:email].blank?
+  end
+
+  def find_or_initialize_user(uid, email)
+    User.find_by(uid: uid) || User.new(uid: uid, email: email, provider: PROVIDER)
+  end
+
+  def sync_attributes(user, claims)
+    user.email = claims[:email]
+    user.full_name = claims[:name]
+    user.provider = PROVIDER
+
+    # IdP handles MFA; skip app MFA preference/challenge (same as StaffUserProvisioner)
+    user.mfa_preference ||= "opt_out"
+  end
+end
diff --git a/reporting-app/spec/services/member_oidc_provisioner_spec.rb b/reporting-app/spec/services/member_oidc_provisioner_spec.rb
new file mode 100644
index 00000000..303079fc
--- /dev/null
+++ b/reporting-app/spec/services/member_oidc_provisioner_spec.rb
@@ -0,0 +1,205 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe MemberOidcProvisioner, type: :service do
+  subject(:provisioner) { described_class.new }
+
+  describe "#provision!" do
+    context "with valid claims" do
+      let(:claims) { mock_member_claims }
+
+      it "creates a new user on first login" do
+        expect { provisioner.provision!(claims) }.to change(User, :count).by(1)
+      end
+
+      it "returns the created user" do
+        user = provisioner.provision!(claims)
+
+        expect(user).to be_persisted
+        expect(user.uid).to eq("member-user-456")
+      end
+
+      it "sets user attributes from claims" do
+        user = provisioner.provision!(claims)
+
+        expect(user.email).to eq("john.smith@example.com")
+        expect(user.full_name).to eq("John Smith")
+      end
+
+      it "sets provider to member_oidc" do
+        user = provisioner.provision!(claims)
+
+        expect(user.provider).to eq("member_oidc")
+      end
+
+      it "does not set a role (members have no staff role)" do
+        user = provisioner.provision!(claims)
+
+        expect(user.role).to be_nil
+      end
+
+      it "handles nil name gracefully" do
+        claims = mock_member_claims(name: nil)
+
+        user = provisioner.provision!(claims)
+
+        expect(user.full_name).to be_nil
+      end
+
+      it "sets mfa_preference to opt_out for new users" do
+        user = provisioner.provision!(claims)
+
+        expect(user.mfa_preference).to eq("opt_out")
+      end
+    end
+
+    context "when user already exists" do
+      let!(:existing_user) do
+        User.create!(
+          uid: "member-user-456",
+          email: "old.email@example.com",
+          full_name: "Old Name",
+          provider: "member_oidc"
+        )
+      end
+
+      it "finds existing user by UID" do
+        claims = mock_member_claims
+
+        expect { provisioner.provision!(claims) }.not_to change(User, :count)
+      end
+
+      it "updates email when changed in IdP" do
+        claims = mock_member_claims(email: "new.email@example.com")
+
+        expect { provisioner.provision!(claims) }
+          .to change { existing_user.reload.email }
+          .from("old.email@example.com")
+          .to("new.email@example.com")
+      end
+
+      it "updates name when changed in IdP" do
+        claims = mock_member_claims(name: "New Name")
+
+        expect { provisioner.provision!(claims) }
+          .to change { existing_user.reload.full_name }
+          .from("Old Name")
+          .to("New Name")
+      end
+
+      it "does not change role (members remain without role)" do
+        claims = mock_member_claims
+
+        provisioner.provision!(claims)
+
+        expect(existing_user.reload.role).to be_nil
+      end
+
+      it "preserves mfa_preference if already set" do
+        existing_user.update!(mfa_preference: "opt_out")
+        claims = mock_member_claims
+
+        provisioner.provision!(claims)
+
+        expect(existing_user.reload.mfa_preference).to eq("opt_out")
+      end
+
+      it "sets mfa_preference to opt_out if not already set" do
+        existing_user.update!(mfa_preference: nil)
+        claims = mock_member_claims
+
+        provisioner.provision!(claims)
+
+        expect(existing_user.reload.mfa_preference).to eq("opt_out")
+      end
+    end
+
+    context "with invalid claims" do
+      it "raises ArgumentError when claims is nil" do
+        expect { provisioner.provision!(nil) }
+          .to raise_error(ArgumentError, /claims cannot be nil/)
+      end
+
+      it "raises ArgumentError when uid is missing" do
+        claims = mock_member_claims.except(:uid)
+
+        expect { provisioner.provision!(claims) }
+          .to raise_error(ArgumentError, /uid is required/)
+      end
+
+      it "raises ArgumentError when uid is blank" do
+        claims = mock_member_claims(uid: "")
+
+        expect { provisioner.provision!(claims) }
+          .to raise_error(ArgumentError, /uid is required/)
+      end
+
+      it "raises ArgumentError when email is missing" do
+        claims = mock_member_claims.except(:email)
+
+        expect { provisioner.provision!(claims) }
+          .to raise_error(ArgumentError, /email is required/)
+      end
+
+      it "raises ArgumentError when email is blank" do
+        claims = mock_member_claims(email: "")
+
+        expect { provisioner.provision!(claims) }
+          .to raise_error(ArgumentError, /email is required/)
+      end
+    end
+
+    context "when user has existing role from staff SSO" do
+      let!(:existing_user) do
+        User.create!(
+          uid: "member-user-456",
+          email: "staff-turned-member@example.com",
+          full_name: "Staff Member",
+          provider: "sso",
+          role: "caseworker"
+        )
+      end
+
+      it "finds existing user by UID regardless of provider" do
+        claims = mock_member_claims
+
+        expect { provisioner.provision!(claims) }.not_to change(User, :count)
+      end
+
+      it "updates provider to member_oidc" do
+        claims = mock_member_claims
+
+        expect { provisioner.provision!(claims) }
+          .to change { existing_user.reload.provider }
+          .from("sso")
+          .to("member_oidc")
+      end
+
+      it "preserves existing role (does not clear it)" do
+        claims = mock_member_claims
+
+        provisioner.provision!(claims)
+
+        expect(existing_user.reload.role).to eq("caseworker")
+      end
+    end
+
+    context "without role mapping (unlike staff provisioner)" do
+      it "successfully provisions user without any role logic" do
+        claims = mock_member_claims
+
+        expect { provisioner.provision!(claims) }.not_to raise_error
+      end
+
+      it "returns a user without role" do
+        claims = mock_member_claims
+
+        user = provisioner.provision!(claims)
+
+        expect(user.role).to be_nil
+        expect(user).to be_persisted
+      end
+    end
+  end
+end
diff --git a/reporting-app/spec/support/sso_helpers.rb b/reporting-app/spec/support/sso_helpers.rb
index b32222f9..2aabbc01 100644
--- a/reporting-app/spec/support/sso_helpers.rb
+++ b/reporting-app/spec/support/sso_helpers.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
-# Shared test helpers for SSO testing
-# Used by StaffUserProvisioner, RoleMapper, and controller specs
+# Shared test helpers for SSO and OIDC testing
+# Used by StaffUserProvisioner, MemberOidcProvisioner, RoleMapper, and controller specs
 module SsoHelpers
   # Returns mock staff user claims for provisioning tests
   # @param overrides [Hash] values to override in the default claims
@@ -16,6 +16,17 @@ def mock_staff_claims(overrides = {})
     }.merge(overrides)
   end
 
+  # Returns mock member user claims for provisioning tests
+  # @param overrides [Hash] values to override in the default claims
+  # @return [Hash] Member claims with symbol keys (no groups or region)
+  def mock_member_claims(overrides = {})
+    {
+      uid: "member-user-456",
+      email: "john.smith@example.com",
+      name: "John Smith"
+    }.merge(overrides)
+  end
+
   # Returns a mock role mapping configuration hash
   # @param overrides [Hash] values to override in the default config
   # @return [Hash] Role mapping configuration
@@ -106,9 +117,10 @@ def configure_sso_for_test(config = nil)
   config.include SsoHelpers, type: :helper
   config.include SsoHelpers, sso: true
 
-  # Reset OmniAuth after each SSO test
+  # Reset OmniAuth after each SSO/OIDC test
   config.after(:each, type: :request) do
     OmniAuth.config.test_mode = false
     OmniAuth.config.mock_auth[:sso] = nil
+    OmniAuth.config.mock_auth[:member_oidc] = nil
   end
 end