Ranc
- Full Name: Ranc
- Species: Klingon
- Gender: Male
- By 2266: Captain's personal guard, Klingon Defense Force; IKS d'k tahg (TOS Novel: Errand of Vengeance: Killing Blow)
- Death: April 3, 2266; IKS d'k tahg (TOS Novel: Errand of Vengeance: Killing Blow)