Abstract: The present disclosure provides a leg rest assembly for a wheelchair, comprising: a leg support for supporting at least one lower leg of a user seated in the wheelchair, and a mechanism for raising and lowering the leg support between a base position and an elevated position on the wheelchair, the mechanism comprising a linkage that interconnects the leg support with a frame of the wheelchair and drive means for powering movement of the linkage to drive the leg support between the base position and elevated position. The linkage includes a first bracket to which the leg support is connected for pivoting movement about a first pivot axis, a second bracket for rigid connection with the frame of the wheelchair, and an articulating arm subassembly which interconnects the first bracket and second bracket and is driven by the drive means for movement of the leg support.