SmackDown's 20th Anniversary, or the 20th Anniversary of SmackDown, was a special episode of WWE's weekly television program SmackDown that took place on October 4, 2019, and commemorated the program's 20th anniversary. It was broadcast live on Fox, and marked the SmackDown's return to Friday nights.

WWE SmackDown, also known as Friday Night SmackDown or simply SmackDown, is an American professional wrestling television program produced by WWE. It airs live every Friday at 8 p.m. Eastern Time (ET) on Fox, although some sporting events occasionally move it to FS1. Fox Deportes simulcasts the program with Spanish-language commentary. The show features characters from the SmackDown brand, to which WWE employees are assigned to work and perform. It is considered to be one of WWE's two flagship programs, along with Monday Night Raw.