The 2S5 Giatsint-S (Russian: 2С5 «Гиацинт-С»; English: hyacinth) is a Soviet/Russian 152 mm self-propelled gun. "2S5" is its GRAU designation. It is NBC protected.
Production of the 2S5 Giatsint-S started in 1976 along with the towed version the 2A36 Giatsint-B. It was introduced into service in 1978 and has also been known as the M1981 by the United States.