The RM-51 (Raketomet vzor 1951) multiple rocket launcher was a Czechoslovak Army alternative of the BM-13 multiple rocket launcher developed in the 1950s.

• vz. 51 – Original model, based on Praga V3S 6×6 truck.
• M-51 – Export version used by Austria, based on Steyr 680 M3 6×6 truck.
• RM-51 – Export variant, based on ZIS-151 and ZIL-157 6×6 trucks.

•  Austria – 18 delivered in 1974, designated M-51.^[2]
•  Bulgaria – 24 delivered in 1963.^[3]
•  Democratic Republic of the Congo – 6 in service as of 2021.^[4]
•  Indonesia – In 2012, Indonesian Army retrofitted their RM-51, including replacing the original Praga V3S truck with Reo M35A2 truck.^[5][6]
•  Czechoslovakia
•  Cuba – 20 delivered between 1965 and 1966.^[3]
•  Egypt – 50 delivered between 1957 and 1958.^[3]
•  Libya – 36 delivered between 1976 and 1977.^[3]
•  Romania – 58 delivered between 1956 and 1965.^[3] Designated R-2,^[7] the launchers were later mounted on ZIL-157 trucks.^[8]

• 
  Vintage vz. 51 on Praga V3S chassis
• 
  Egyptian vz. 51 during Six-Day War
• 
  Captured Egyptian vz. 51 at parade in Jerusalem, 1968

• RM-70 multiple rocket launcher – the successor of RM-51

• Christopher Chant, A compendium of armaments and military hardware, Routledge, 1987, ISBN 0-7102-0720-4
• Christopher F. Foss, Artillery of the World, ISBN 0-7110-0505-2
• Franklin D. Margiotta, Brassey's encyclopedia of land forces and warfare, Brassey's, 1996, ISBN 1-57488-087-X
• Stroea, Adrian, col. conf. univ. dr., Băjenaru, Gheorghe, lt. col, Artileria română în date și imagini, Editura Centrului Tehnic-Editorial al Armatei, București, 2010, ISBN 978-606-524-080-3

• Description and photos in Slovak