A portable leg cast support includes an upper member and a lower member in a telescoping relation. A row of locking holes spanning the length of the upper member allows the telescoping components to be locked together at a user-selectable height for supporting a user's leg cast at an elevated position. A stirrup is pivotally connected to the top of the upper telescopic member for accepting and supporting a leg at the ankle. When the upper and lower telescoping members are in a retracted configuration and the stirrup is folded against the upper member, the support can be strapped to the leg cast for transport until it is needed as a support.