John O'Connor (c. 1835 – 12 January 1891) was an Irish nationalist politician who was elected in 1885 as Lord Mayor of Dublin and also as a Member of Parliament (MP) for South Kerry. O'Connor was the son of a farmer at Staplestown, Co. Kildare, and owned several public houses. He married the daughter of a pawnbroker, a Mr White. He was an alderman of Dublin Corporation and Lord Mayor in 1885.