Bushwalker, 74, missing in Blue Mountains

Police are appealing for help to find a bushwalker missing in Sydney's Blue Mountains region.

David Bush, 74, was last seen at Evans Lookout carpark about 9am on Saturday, police say.

Mr Bush told family he was going for a bushwalk but he did not come home and hasn't been heard from since.

Police are conducting inquiries to find him, with serious concerns held for his welfare.

Mr Bush is of Caucasian appearance, about 175cm tall with a thin build and grey hair and was last seen wearing black pants, a black jacket and a black beanie and carrying a blue backpack.