The 23/70 was a car produced by Arrol-Aster between 1927 and 1930. Approximately 80 cars were made.

It shared the same basic layout as the 17/50 but was fitted with a straight-8 sleeve valve engine. The exact capacity of the engine is quoted by various sources as between 2760 and 3293 cc. The engine was said to be vulnerable if taken above 3400 rpm. The car could be distinguished from its smaller companion by a large "8" on the radiator grille. A free wheel mechanism was offered as an option.