Aarau WSB railway station is a railway station in the municipality of Aarau, the capital city of the Swiss canton of Aargau. It is the principal intermediate point on the 1,000 mm gauge Schöftland–Aarau–Menziken line of Aargau Verkehr. The station is the main point of transfer to the Swiss Federal Railways (SBB) lines, and is situated across Hintere Bahnhofstrasse from the south side of the SBB station. The station buildings and platforms of both stations are connected by a common pedestrian subway.

The Schöftland–Aarau–Menziken railway line is a metre gauge railway line in the canton of Aargau in Switzerland. It provides a through service, in the form of an inverted 'V', from Schöftland to Menziken via Aarau. The two parts of the V were built separately, with the Aarau–Menziken railway line running through the Wynental, and the Aarau–Schöftland railway line running through the Suhrental.