Fälthaubits 77 (Swedish "Field Howitzer 77") or FH77 is a Swedish 155 mm howitzer. It was developed and manufactured by Bofors. It was available in two versions, the original (sometimes referred to as Haubits 77 A) with a 38 calibre barrel and sliding block mechanism, and the later FH77 B export version with a 39 calibre barrel and an interrupted screw breech. India is currently developing an upgraded (155mm/45 calibre) version of the FH-77 called FH-77 B02.