Simon Richard Spillett (born 4 November 1974, Chesham, Buckinghamshire, England) is a British jazz tenor saxophonist. He has won the BBC Jazz Awards Rising Star (2007), Jazz Journal's Critics' Choice album of the Year (2009), the British Jazz Awards Top Tenor Saxophonist (2011), and Services to British Jazz award (2016).

By 2017, he was leading his own quartet featuring pianist John Critchinson, bassist Alec Dankworth and drummer Clark Tracey, as well as appearing with bands led by other leaders including Ronnie Scott's Jazz Orchestra. After John Critchinson died, Rob Barron joined the quartet on piano. Drummer Pete Cater replaced Tracey in 2020.

Leading British jazz figures with whom he has worked include Sir John Dankworth, Stan Tracey, Peter King, Liane Carroll, Tina May, John Etheridge, Guy Barker, Alan Barnes and Bobby Wellins. American musicians with whom he has worked include Jon Hendricks, Kurt Elling, Bobby Shew and Monica Mancini.

Spillett's biography of saxophonist Tubby Hayes, The Long Shadow Of The Little Giant, was published by Equinox in 2015.

From 2016 to 2018 he contributed a regular monthly column to Jazz Journal, mixing humorous reflections on his experiences as a musician with observations about famous historical jazz figures. He has also acted as a compere at jazz festivals and appears in the anchor interview role in the 2015 documentary film Tubby Hayes: A Man In A Hurry.