William Traylen (25 February 1843 – 27 December 1926) was an Australian Methodist minister and politician who served in the Legislative Assembly of Western Australia from 1890 to 1897.

He returned to Australia in 1867, ministering at York for three years before being fully ordained at Wesley Church, Perth, in 1870.

[1] In 1886, Traylen unsuccessfully ran for the Legislative Council, losing a by-election for the seat of Perth to Edward Scott.

[1] He eventually entered parliament at the 1890 general election (the first to be held for the Legislative Assembly), winning the seat of Greenough.

[1] Traylen lost his seat to Richard Pennefather at the 1897 election,[2] and after leaving parliament was appointed chairman of the Perth Water Board, serving in that position from 1898 to 1904.