Series 51-59

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