Autotrix was a British automobile manufacturer that operated from 1911 to 1914, based in Weybridge, Surrey. The company was founded by Edmunds & Wadden and specialized in the production of three-wheeled cyclecars.

The Autotrix vehicles were offered in two distinct sizes. The smaller model was equipped with a 4-horsepower single-cylinder JAP engine and utilized a belt drive system. In contrast, the larger model featured a more powerful 9-horsepower two-cylinder engine, also sourced from JAP, and incorporated a Chater-Lea gearbox along with a chain drive. Additionally, for customers who preferred a water-cooled engine, a 6-horsepower Fafnir engine was available for the larger chassis.

Despite its brief existence, Autotrix contributed to the early automotive landscape in the United Kingdom during the early 20th century.