Series 51 to Series 59 may refer to:
Area 51 (series), the game series nRF51 series, Nordic Semiconductor chips series GAZ-51, USSR truck series 52 series, the Japanese train series 52 Super Series, the yacht racing series Series 54 (SNCB), diesel locomotives series Linksys WRT54G series, line of routers Mitsui 56 series, cargo ship series WPC 56, British TV series KiHa 59 series, the Japanese train series