The Caves of Kahless were a subterranean complex of chambers located in the northern polar region of Qo'noS. Named after Kahless, traditional observances of the Day of Honor were held in these caves. (DIS: "The War Without, The War Within"; VOY: "Day of Honor")

In 2374, B'Elanna Torres and Tom Paris programmed a holodeck re-creaton of these caves, so that Torres could observe the holiday. (VOY: "Day of Honor")

This location was not named in the episode "Day of Honor"; the name was from the Star Trek Encyclopedia (4th ed., vol. 1, p. 125). The name was canonized in "The War Without, The War Within".