John Alexander McCullough (17 January 1860 – 29 July 1947) was a New Zealand tinsmith, trade unionist and political activist.
He was born in Belfast, County Antrim, Ireland on 17 January 1860.
He was elected a member of the Christchurch City Council from 1912 to 1917.
The Riccarton electorate was contested by three candidates in the . George Witty, the incumbent since the , was successful, with Bert Kyle coming second and McCullough coming third. The First Labour Government appointed McCullough to the New Zealand Legislative Council on 9 March 1936. At the end of his seven-year term, he was reappointed on 9 March 1943. He remained a member until his death on 29 July 1947.
He died in Christchurch on 29 July 1947 aged 87.
The 1908 Blackball miners' strike