The Akif-class was one of the early series of D7-class Klingon battle cruiser starships in use around the time of the 23rd century. Many of these vessels were transferred to the service of the Romulan Star Empire as a result of a mid-23rd century alliance between the two powers. (TOS novel: The Romulan Way)
- Diane Duane and Peter Morwood's writing mentions this class several times in reference to a predecessor to the K't'inga-class, but few vessels were explicitly mentioned as belonging to this class. These include Charvanek's triad in TOS episode: "The Enterprise Incident".
- ChR Memenda (Romulan) (TOS episode: "The Enterprise Incident")
- 2 Romulan vessels in company with Memenda (TOS episode: "The Enterprise Incident")