Bartholomew Gill was the pen name of Mark C. McGarrity (July 22, 1943 – July 4, 2002), an Irish-American crime fiction and mystery novelist and newspaper features writer and columnist writing on nature and outdoor recreation for The Star-Ledger. He was the author of 22 mystery novels, set in Ireland, and featuring a "resourceful police detective named Peter McGarr." For his pen name, McGarrity used the name of his maternal grandfather, Bartholomew Gill, who "was a great storyteller." McGarrity wrote five novels and a work of nonfiction under his real name, and his writings for the Star-Ledger were published under his true name.