H'ohk was a male Klingon who spent some time as a guest professor at Starfleet Academy, during the mid-24th century, teaching Klingon physiology.

Among his students was Kathryn Janeway, who remembered him to have been very harsh with the cadets. This helped Janeway to retain course-content years later, allowing her to impress The Doctor when she anticipated his request for 10 ccs of alizine to treat B'Elanna Torres for anaphylactic shock. (VOY: "Darkling")

This character was only mentioned in dialogue.