John O'Mahony (1844–1912) was an Irish Catholic priest, antiquarian, writer and founder member of the Cork Historical and Archaeological Society.
[1] He was ordained in 1870 and moved to Cork city where he was a curate in South (St. Finbar's) Parish.
[1] During the 1880s, he was a supporter of the Land League, Home Rule movement and of Charles Stewart Parnell's Irish Parliamentary Party.
[5] After Delany's death, O'Mahony returned to Cork to North (Cathedral) Parish.
[1] In later life, O'Mahony was a supporter of the Gaelic League and was president of the Maynooth Union.