Yeoman Martha Landon was a 23rd century Starfleet operations division crew member assigned to the USS Enterprise under the command of Captain James T. Kirk. While serving aboard the Enterprise, Landon was for a time romantically involved with Pavel Chekov.
In 2267, Landon was one of nine crewmembers assigned to landing party that conducted a survey on Gamma Trianguli VI. Landon and Chekov's open display of affection angered the planet's natives because love and intimacy were forbidden on the planet by Vaal. (TOS: "The Apple")