Mark Anthony Fagan (17 November 1873 – 31 December 1947) was a New Zealand politician of the Labour Party and a union secretary.

[1] His second marriage was to Monica McKittrick (née Gardiner), a widow with three children whom he married on 10 September 1917 in Christchurch.

[1] Fagan was expected by many to stand in the 1918 Grey by-election after the sitting member, Paddy Webb, was jailed for his vocal opposition to conscription, but the Labour Party hierarchy chose Harry Holland from Wellington instead based on the latter's strong showing in the Wellington North by-election a few months prior.

[1][2] Fagan stood in the 1925 general election in the Motueka electorate, but was beaten by the incumbent, Richard Hudson of the Reform Party.

[1] On 11 June 1930 he was appointed to the Legislative Council by the United Government, and at the end of each seven-year term, he was reappointed twice.