diff --git a/Core.lua b/Core.lua
index f950bea..b636db2 100644
--- a/Core.lua
+++ b/Core.lua
@@ -15,11 +15,19 @@ F.Events:SetScript("OnEvent", function(self, event, ...)
         F.InitDB()
         F.State.session.startTime = time()
         F.State.session.lastXP = UnitXP("player")
+        -- Hide Blizzard XP / Reputation bars if configured
+        if F.UI and F.UI.HideBlizzardBars then
+            F.UI.HideBlizzardBars()
+        end
     end
 
     if event == "PLAYER_ENTERING_WORLD" then
         F.State:UpdatePlayerXP()
         F.State:UpdateQuestXP()
+        -- Ensure Blizzard bars stay hidden after entering world (in case something re-enabled them)
+        if F.UI and F.UI.HideBlizzardBars then
+            F.UI.HideBlizzardBars()
+        end
 
     elseif event == "PLAYER_XP_UPDATE" then
         local currentXP = UnitXP("player")
diff --git a/UI.lua b/UI.lua
index 8e3e3a4..07445f8 100644
--- a/UI.lua
+++ b/UI.lua
@@ -198,6 +198,39 @@ function F.UI.Create()
 
     -- Perform an initial update to set values
     F.UI.Update()
+
+    -- Hide default Blizzard bars if the option is enabled (guarded in the function)
+    F.UI.HideBlizzardBars()
+end
+
+-- Utility: Hide Blizzard's default experience and reputation bars (if configured)
+-- This is safe even if the global Blizzard frames don't exist (we check for them).
+function F.UI.HideBlizzardBars()
+    if not (F and F.DB and F.DB.hideBlizzardXPBar) then return end
+
+    -- Hide the main experience bar if present
+    if MainMenuExpBar then
+        MainMenuExpBar:UnregisterAllEvents()
+        MainMenuExpBar:Hide()
+    end
+
+    -- Hide the reputation watch bar (classic name)
+    if ReputationWatchBar then
+        ReputationWatchBar:UnregisterAllEvents()
+        ReputationWatchBar:Hide()
+    end
+
+    -- Hide the status-tracking manager (modern clients)
+    if StatusTrackingBarManager then
+        StatusTrackingBarManager:UnregisterAllEvents()
+        StatusTrackingBarManager:Hide()
+    end
+
+    -- Some clients expose a performance/progress bar container; hide if present
+    if MainMenuBarPerformanceBar then
+        MainMenuBarPerformanceBar:UnregisterAllEvents()
+        MainMenuBarPerformanceBar:Hide()
+    end
 end
 
 --- The Main Draw Function (Called from Core.lua)