The Rexer rifle was a British self-loading rifle designed by the Rexer Manufacturing Company.
The Rexer rifle was designed in response to the British Army's interest in adopting a self-loading rifle. It was a semi-automatic design chambered for 6.5mm, although it could be re-chambered for .303 or 7x57mm. It was demonstrated at Bisley and Enfield against the Hallé rifle, but development of the Rexer rifle was cut short when Dansk Rekylriffel Syndikat, the manufacturers of the Madsen machine gun (which Rexer also manufactured under license), filed a lawsuit against Rexer, claiming their rifle had infringed DRS's patents. The court case ended in favor of DRS and Rexer was put out of business.