Thomas Stanislaus McAllister (1878 – 29 April 1950) [1] was an Irish nationalist politician.

McAllister worked as a solicitor[2] and became active in the United Irish League.

[2] He took his seat almost immediately, alongside Joe Devlin, and the rest of the party gradually followed suit.

He became the party leader in the Senate and served until his death in 1950.

[1] He was the first president of St Malachy's College Old Boys' Association.