Arrol-Aster was a British car maker founded in 1927 when Arrol-Johnston and Aster merged. The Wembley, London works of Aster was closed and production concentrated at the Heathhall, Dumfries factory of Arrol-Johnston.

At first, manufacture of all the cars previously made by the two companies was continued along with those made under the Galloway badge but in 1928 a rationalisation was carried out. The cars were complex and expensive and sales were poor resulting in the company going into receivership in 1929 and finally closing in 1931.

The company was responsible for making the body for Sir Malcolm Campbell's Bluebird car in 1929 and an Arrol-Aster car was entered in the 1931 24 hour race at Le Mans.