Major Sir Thomas Karran Maltby (17 October 1890 – 2 June 1976) was a politician in Victoria, Australia.

Matlby was born in Barnadown, a small town near Bendigo, Victoria, to Thomas Karran Maltby (a shopkeeper from the Isle of Man) and Ada Agnes Fascher.

[3] Five years later, Maltby was elected to the legislative assembly when he won the state by-election for the seat of Barwon, following the death of the Nationalist member Edward Morley.

In 1941, Maltby advocated for a UAP conference with the United Australia Organisation to discuss reform and reorganisation of the UAO.

The Country–Liberal coalition government of Albert Dunstan and Thomas Hollway collapsed, and the Governor of Victoria, Sir Winston Dugan commissioned Ian Macfarlan to form a "stop-gap ministry" with the sole purpose of passing supply.

Maltby was appointed Deputy Premier, Chief Secretary and Minister for Electrical Undertakings in the short-lived ministry, which lasted from 2 October to 21 November 1945.

[8] On 2 December 1947, Maltby achieved what he called "a boyhood ambition" when he was elected Speaker of the Victorian Legislative Assembly.

Hollway agreed, and Maltby was one of the front runners to replace Warner in the ensuing reshuffle, provided he was not renominated as Speaker.