Marsh Lake (Mud Lake) is a widening of the Yukon River southeast of Whitehorse, Yukon, Canada. It is over 30 kilometres long and ranges from three to four kilometres wide.
The lake forms part of a chain of finger lakes, sometimes referred to as The Southern Lakes, that form the headwaters of the Yukon River.
The community of Marsh Lake, Yukon is located along the northern shores of the lake.
