Matthew Lewis Moss KC (1 December 1863 – 28 February 1946) was a lawyer and politician who served in the Parliament of Western Australia on three separate occasions – in the Legislative Assembly from 1895 to 1897, and in the Legislative Council from 1900 to 1901 and again from 1902 to 1914. He was a minister in the governments of Alf Morgans (1901), Walter James (1902–1904), and Hector Rason (1905–1906). Moss was born in New Zealand and arrived in Western Australia in 1891. He left for England in 1914 and spent the rest of his life there, although he maintained connections with Australia, on two occasions acting as Agent-General for Western Australia.