UPN20 may refer to one of several former UPN network affiliated TV stations that had broadcast on UHF channel 20:
KIKU in Honolulu, Hawaii (now an independent station) KTVD in Denver, Colorado (now affiliated with MyNetworkTV) KTXH in Houston, TX (now a MyNetworkTV owned-and-operated station) WCCT-TV in Hartford, Connecticut (now affiliated with The CW) WDCA in Washington, DC (now a MyNetworkTV owned-and-operated station)