John Beirne, Jr (died 23 October 1967) was an Irish Clann na Talmhan politician. He was first elected to Dáil Éireann as a Clann na Talmhan Teachta Dála (TD) for the Roscommon constituency at the 1948 general election. He was re-elected at the 1951, 1954 and 1957 general elections. He lost his seat at the 1961 general election.
His father John Beirne, Sr also served as a Clann na Talmhan TD for Roscommon from 1943 to 1948.