John Leahy (15 July 1854 – 20 January 1909) was a newspaper proprietor and member of the Queensland Legislative Assembly.

After receiving his education he moved to Queensland where he was said to have worked as a rural labourer before becoming postmaster at Windorah then settling in Thargomindah.

[2] It was here that Leahy held a partnership in a cordial factory and, with his brother Patrick, became part-owner of the Thargomindah Herald.

[1] He was minister for Railways and Public Works from 1901 to 1903 and Speaker of the Queensland Legislative Assembly from 1907 to 1909.

[1] On the 11 February 1886, Leahy married Annie Colbert at Thargomindah and together had one son and six daughters.