Saidapet taluk was a taluk of Chengalpattu district that existed from 1798 to 1997. The headquarters of the taluk was the town of Saidapet. The taluk largely comprised the suburbs of Madras city. Saidapet taluk was surrounded by Ponneri taluk in the north, Tiruvallur taluk in the north-west, Poonamallee taluk in the west, Sriperumbudur taluk to the south-west and Chengalpattu taluk in the south. The Bay of Bengal lay to the east. Saidapet taluk completely surrounded Madras city on all the three sides with the Bay of Bengal on the fourth. When Chengalpattu district was bifurcated into Kanchipuram and Tiruvallur districts in 1997, Saidapet taluk was also bifurcated into Ambattur taluk of Tiruvallur district and the Tambaram taluk of Kanchipurm district.