John J. Geary (c. 1835 – 1870) was a Fenian active in Cork, Ireland in the mid-19th century. Geary was from near Newcastle West, County Limerick. He was an associate of other Cork Fenians Brian Dillon, James Mountaine and John Lynch. A grocer for a time, Geary operated a pub at 27 North Main Street, Cork which was a regular meeting place of local Fenians. He was accused of being the "Head Centre" of the Fenian Brotherhood in Cork.[1] Geary avoided arrest and fled to New York where he lived in exile.