Abstract: A mold is provided for forming orthopedic soles and plantar moldings adapted to the feet of patients, characterized in that it is formed of a tray (1) with an essentially vertical wall (6), whose bottom (7) reproduces the shape and the instep of a shoe, means (2) for fixing relief correcting elements (4, 5) to this bottom for conferring thereon a surface adapted to the plantar arch of the patient, and a flexible and resilient cushion (3) extending over this bottom.This mold is used for forming orthopedic soles and plantar moldings by using a thermoformable sheet (9) placed in the tray and on which the foot of the patient bears.