Bob's Lake is a lake in the James Bay and Abitibi River drainage basins in the city of Timmins, Cochrane District in northeastern Ontario, Canada.
The lake is about long and wide, lies at an elevation of , and is located in the community of Porcupine on Ontario Highway 101. The primary inflow is an unnamed creek at the northeast, and the primary outflow is Bob's Creek at the southwest, which flows to Porcupine Lake and via the Porcupine River and the Frederick House River to the Abitibi River.
A second Bobs Lake in Cochrane District, with a similarly named primary outflow Bobs Creek, and which is also in the Abitibi River drainage basin, is Bobs Lake (Shallow River) (without the apostrophe) and is located to the northeast.