The Mitsubishi Lancer Legnum is a midsize automobile manufactured by the Mitsubishi Motors Corporation. The Mitsubishi Lancer Legnum was launched in 1969 as a two and four-door sedan, sold in some markets as the Colt Galant. It featured a choice of 1.3 or 1.5 L four-cylinder engines. It was sold in the United States as the Dodge Colt from 1971. From 1970, a fastback coupé model, the Hardtop, was added. It was the first Japanese production passenger car without side pillars.

The same year saw the release of the most powerful first-generation model, the GTO, with a 1.6 L engine rated at 125 PS. The second generation Lancer Legnum sedan and GTO were more widely exported and was sold in Australia as the Chrysler Valiant Galant and in Europe as the Colt Galant. This model was more curvaceous, influenced by coke-bottle styling, and featured a larger, 1850 cc engine, as well as a new 2.0 L 'Astron' engine developing 125 PS. It was also offered as the Dodge Colt in the US. The third-generation Lancer Legnum, dating from 1976, was divided into two models: the Galant Sigma (for the sedan and wagon) and the Galant Lambda (the coupe). The former was sold in many markets as the Mitsubishi Lancer Legnum (without the word 'Sigma') and in Australia as the Chrysler Sigma (until 1980, after which it became the Mitsubishi Sigma).