The PGM Ultima Ratio is a French-designed and manufactured sniper rifle. It uses the 7.62×51 mm NATO cartridge and can, depending on the (barrel) variant, be chambered for several other cartridges. The PGM Ultima Ratio is intended to fulfill an anti-personnel role and is produced by PGM Précision of France. Its main commercial competitors/equivalents on the high-end factory sniper rifle market are the Accuracy International Arctic Warfare and Sako TRG product lines. All of these rifles are similar in performance.
The name of the rifle is a Latin expression and means "the last resort (as force)" and derives from the expression ultima ratio regum (the final argument of kings, i.e., war) that King Louis XIV of France had engraved on his cannons.