William Abraham (1840 – 2 August 1915) was an Irish Member of Parliament (MP) in the United Kingdom House of Commons.
In December 1890, he was the proposer of the vote of no confidence in Charles Stewart Parnell as leader in Committee Room 15, and he joined the Anti-Parnellite Irish National Federation.
He was unopposed at the by-election for Dublin Harbour in June 1910, and won comfortably against an O'Brienite Nationalist in the same seat in the general election of December 1910.
According to the Irish Independent, he was assiduous in his duties at Westminster, and spoke at one time or another in every constituency in Great Britain, including Orkney and Shetland.
However, in Maume's view, his age and lack of local contacts made him ineffective in his final role as a Dublin MP.