Leslie Newburn Rainey (10 January 1881 – 27 August 1962) was an Australian sportsman who played first-class cricket for Victoria and Australian rules football with Essendon and Melbourne in the Victorian Football League (VFL).
After managing only five appearances for Essendon during his time at the club in 1899 and 1900, Rainey crossed to Melbourne where he had more success. He played a full season in 1902, including Melbourne's Semi Final loss to his old club, and kicked 17 goals. Rainey finished his football career with 23 VFL games and 20 goals.
Rainey played his cricket as an all-rounder and participated in two first-class matches for Victoria, both against Tasmania at the Melbourne Cricket Ground. He put in a good performance in the second of those matches, in 1905, scoring an unbeaten 60 and taking 6/46 in Tasmania's second innings.