Mary Mulchaey was an inhabitant of the holographic 19th century Irish village Fair Haven, the daughter of Edith Mulchaey.

Near Ballahick farm, Mary once fell into a well. When her mother returned with help from the Colby family, though, Mary was uninjured talking with Katie O'Clare and did not remember her fall. This incident was among those which arosed the suspicion of the Fair Haveners against their new neighbors (in reality crewmembers of the USS Voyager). (VOY: "Spirit Folk")