If you forgot your Citi card PIN, you can retrieve or reset it by logging into your Citibank online account or mobile app. Navigate to the "Card Services" or "Account Management" section and select "PIN Services" or "Forgot PIN." You will need to verify your identity through a one-time password (OTP) sent to your registered phone number or email. Follow the on-screen instructions to set a new PIN. Alternatively, you can contact Citibank customer service for assistance. This process ensures you can securely retrieve or reset your PIN and regain full access to your Citi card.