The B57 was a medium-length B-road in east County Antrim.
The road started on the A8 on the western side of Ballynure and headed southwest. It soon reached Ballyclare before continuing in the same direction as far as Templepatrick, where it ended on the A6.
The B57 was still in existence in the 1960s but was upgraded to Class I status soon afterwards, possibly in connection with the construction of the M2. Although the road was upgraded, it kept its number, becoming the A57, which it remains. Ballyclare is now bypassed.