Rib Lake is a long and narrow lake in the Town of Latchford and in the Municipality of Temagami in Northeastern Ontario, Canada, located about 9 kilometres (6 mi) southeast of the centre of the community of Latchford and 9 kilometres (6 mi) northeast of the community of Temagami North. The lake is in the Ottawa River drainage basin and is the main access for canoeists en route to Rib Mountain. The lake was originally called Gitchiway-Pigigonaysing by the Teme-Augama Anishnabai, meaning Big Rib Lake.