John Horgan (1876 – 27 June 1955) was an Irish politician from Cork who had a very brief career as a parliamentary representative in the Irish Free State. He served for three months as a Teachta Dála (TD) for the National League Party, a short-lived party which advocated closer ties with the United Kingdom. He was a member of the Cork Corporation, served a term as Lord Mayor of Cork.

He was born in Limerick,^[1] the son of a County Cork ironmonger,^[1] and master plumber.

He was elected at the June 1927 general election as a TD for the Cork Borough constituency, taking his seat as one of eight National League TDs in the 5th Dáil.^[2] However, the 5th Dáil was short-lived, and at the September 1927 general election Horgan and all but two of his party's TDs lost their seats.^[3] The party went bankrupt in 1928, and was formally disbanded in 1931.

Horgan subsequently joined Cumann na nGaedheal, and stood again as a Cumann na nGaedheal candidate in Cork Borough at the 1932 and 1933 general elections, but did not regain his seat.^[4]

As a member of Fine Gael, Horgan was Lord Mayor of Cork for the term from 1941 to 1942.^[5] He retired from Cork Corporation in 1949 after 25 years' membership.^[6]

He died at his residence, at 2, The Orchards, Glasheen Road, Cork, on 27 June 1955 aged 79.^[6] and is buried at St. Finbarr's Cemetery. His grandson, Seán O'Leary, served as Lord Mayor of Cork from 1972 to 1973.^[1]