战镰(war scythe)是一种简单的武器，通常是用镰刀来制造，将镰刀的刀刃置于长杆前端所制成的步兵武器，类似斩矛(fauchard)。

由于使用镰刀这种农耕器具改造，使战镰经常出现在历史上的农民起义中。像是古希腊历史学家色诺芬在著作「长征记」中就有战车兵使用镰刀作战的纪录、17世纪瑞典入侵(大洪水时代)时波兰农民也曾使用战镰来对抗等。

A fauchard is a type of polearm weapon, which was used in medieval Europe from the 11th through the 14th centuries. The design consisted of a curved blade put atop a 2 m (7 ft) long pole. The blade bore a moderate to strong curve along its length, however unlike a glaive the cutting edge was only on the concave side. This made the fauchard blade resemble that of a sickle or a scythe. This was not a very efficient design for the purposes of war, and was eventually modified to have one or more lance points attached to the back or top of the blade. This weapon is called a fauchard-fork, but is very often erroneously referred to as a guisarme or bill-guisarme since it superficially appears to have a "hook".