Sly or SLY may refer to:
People Sly (surname) Sly Bailey (born 1962), British businesswoman Sly Dunbar (1952–2026), Jamaican drummer Sylvain Grenier (born 1977), Canadian wrestler Sylvester Igboun (born 1990), Nigerian footballer, nicknamed "Sly" Sylvester Stallone (born 1946), American actor Sly Stone (1943–2025), American musician in Sly and the Family Stone
Music Sly (opera), by Ermanno Wolf-Ferrari "Sly" (The Cat Empire song) "Sly" (Massive Attack song) Sly (band), a Japanese heavy metal band
Gaming The Sly Cooper series, including: Sly Cooper and the Thievius Raccoonus Sly 2: Band of Thieves Sly 3: Honor Among Thieves Sly Cooper: Thieves in Time
Other sly, ISO 639-3 code for the Selayar language, Indonesia Sly syndrome, a genetic disease Sly (film), a 2023 documentary film about Sylvester Stallone