diff --git a/change/@itwin-property-grid-react-5e8f999c-021a-422a-9a20-37213d3f8f5c.json b/change/@itwin-property-grid-react-5e8f999c-021a-422a-9a20-37213d3f8f5c.json
new file mode 100644
index 000000000..e15c523c0
--- /dev/null
+++ b/change/@itwin-property-grid-react-5e8f999c-021a-422a-9a20-37213d3f8f5c.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Downgrade missing `IModelApp.userPreferences` log from error to warning and deduplicate",
+  "packageName": "@itwin/property-grid-react",
+  "email": "AzureDevOps@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/packages/itwin/property-grid/src/property-grid-react/api/PreferencesStorage.ts b/packages/itwin/property-grid/src/property-grid-react/api/PreferencesStorage.ts
index dec6ef0d3..da7803594 100644
--- a/packages/itwin/property-grid/src/property-grid-react/api/PreferencesStorage.ts
+++ b/packages/itwin/property-grid/src/property-grid-react/api/PreferencesStorage.ts
@@ -25,13 +25,14 @@ export interface PreferencesStorage {
  */
 export class IModelAppUserPreferencesStorage implements PreferencesStorage {
   #nameSpace = PROPERTY_GRID_NAMESPACE;
+  #warnedAboutMissingPreferences = false;
   constructor(nameSpace = PROPERTY_GRID_NAMESPACE) {
     this.#nameSpace = nameSpace;
   }
 
   public async set(key: string, value: string): Promise<void> {
     if (!IModelApp.userPreferences) {
-      Logger.logError(LOGGER_CATEGORY, `Cannot save user preference ${key} because 'IModelApp.userPreferences' not defined.`);
+      this.logMissingPreferencesWarning(key, "save");
       return;
     }
 
@@ -51,7 +52,7 @@ export class IModelAppUserPreferencesStorage implements PreferencesStorage {
 
   public async get(key: string): Promise<string | undefined> {
     if (!IModelApp.userPreferences) {
-      Logger.logError(LOGGER_CATEGORY, `Cannot get persisted user preference ${key} because 'IModelApp.userPreferences' not defined.`);
+      this.logMissingPreferencesWarning(key, "get");
       return undefined;
     }
 
@@ -68,4 +69,13 @@ export class IModelAppUserPreferencesStorage implements PreferencesStorage {
     }
     return undefined;
   }
+
+  private logMissingPreferencesWarning(key: string, action: "save" | "get") {
+    if (this.#warnedAboutMissingPreferences) {
+      return;
+    }
+    const subject = action === "get" ? "persisted user preference" : "user preference";
+    Logger.logWarning(LOGGER_CATEGORY, `Cannot ${action} ${subject} ${key} because 'IModelApp.userPreferences' not defined.`);
+    this.#warnedAboutMissingPreferences = true;
+  }
 }
diff --git a/packages/itwin/property-grid/src/test/api/PreferencesStorage.test.ts b/packages/itwin/property-grid/src/test/api/PreferencesStorage.test.ts
index 012359ad4..4c9b01713 100644
--- a/packages/itwin/property-grid/src/test/api/PreferencesStorage.test.ts
+++ b/packages/itwin/property-grid/src/test/api/PreferencesStorage.test.ts
@@ -18,19 +18,22 @@ describe("IModelAppUserPreferencesStorage", () => {
   };
 
   let userPreferencesStub: ReturnType<typeof vi.spyOn>;
-  let loggerStub: ReturnType<typeof vi.spyOn>;
+  let logErrorStub: ReturnType<typeof vi.spyOn>;
+  let logWarningStub: ReturnType<typeof vi.spyOn>;
   let storage: IModelAppUserPreferencesStorage;
 
   beforeEach(() => {
     userPreferencesStub = vi.spyOn(IModelApp, "userPreferences", "get");
-    loggerStub = vi.spyOn(Logger, "logError");
+    logErrorStub = vi.spyOn(Logger, "logError");
+    logWarningStub = vi.spyOn(Logger, "logWarning");
     userPreferencesStub.mockReturnValue(imodelUserPreferences);
     storage = new IModelAppUserPreferencesStorage();
   });
 
   afterEach(() => {
     userPreferencesStub.mockReset();
-    loggerStub.mockReset();
+    logErrorStub.mockReset();
+    logWarningStub.mockReset();
     imodelUserPreferences.get.mockReset();
     imodelUserPreferences.save.mockReset();
   });
@@ -46,14 +49,22 @@ describe("IModelAppUserPreferencesStorage", () => {
         throw new Error("Invalid Key");
       });
       await storage.set("test-key", "test-value");
-      expect(loggerStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("Invalid Key"));
+      expect(logErrorStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("Invalid Key"));
     });
 
-    it("logs error if `IModelApp.userPreferences` not defined", async () => {
+    it("logs warning if `IModelApp.userPreferences` not defined", async () => {
       userPreferencesStub.mockReset();
       userPreferencesStub.mockReturnValue(undefined);
       await storage.set("test-key", "test-value");
-      expect(loggerStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("'IModelApp.userPreferences' not defined"));
+      expect(logWarningStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("'IModelApp.userPreferences' not defined"));
+    });
+
+    it("logs warning only once if `IModelApp.userPreferences` not defined", async () => {
+      userPreferencesStub.mockReset();
+      userPreferencesStub.mockReturnValue(undefined);
+      await storage.set("test-key", "test-value");
+      await storage.set("test-key-2", "test-value-2");
+      expect(logWarningStub).toHaveBeenCalledTimes(1);
     });
   });
 
@@ -68,14 +79,22 @@ describe("IModelAppUserPreferencesStorage", () => {
         throw new Error("Invalid Key");
       });
       await storage.get("test-key");
-      expect(loggerStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("Invalid Key"));
+      expect(logErrorStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("Invalid Key"));
     });
 
-    it("logs error if `IModelApp.userPreferences` not defined", async () => {
+    it("logs warning if `IModelApp.userPreferences` not defined", async () => {
       userPreferencesStub.mockReset();
       userPreferencesStub.mockReturnValue(undefined);
       expect(await storage.get("test-key")).toBeUndefined();
-      expect(loggerStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("'IModelApp.userPreferences' not defined"));
+      expect(logWarningStub).toHaveBeenCalledWith("PropertyGrid", expect.stringContaining("'IModelApp.userPreferences' not defined"));
+    });
+
+    it("logs warning only once if `IModelApp.userPreferences` not defined", async () => {
+      userPreferencesStub.mockReset();
+      userPreferencesStub.mockReturnValue(undefined);
+      await storage.get("test-key");
+      await storage.get("test-key-2");
+      expect(logWarningStub).toHaveBeenCalledTimes(1);
     });
   });
 });