We have studied the variation of the Curie temperature &thgr;fand the spontaneous magnetization &sgr;sof several transition metals and some of their solid solutions as a function of the pressure. The measurements were carried out between 77° and 700°K. In the system Ni&sngbnd;Si,d&thgr;f/dpvaries from 0.32×10−3°K bar−1for pure nickel to 0.05×10−3°K bar−1for Ni‐9 at.% Si. The magnitude ofd&thgr;f/dpdecreases by 0.033×10−3°K bar−1per 1% of Si dissolved. In the system Ni&sngbnd;Cu,d&thgr;f/dpdecreases by 0.01×10−3°K bar−1per 1% of Cu dissolved. For polycrystalline cobalt, (&sgr;l)−1(∂&sgr;l/∂p), at 293°K, is equal to −10±1.5×10−7bar−1. The molecular field coefficient, representing the exchange integrals, increases for a decrease in volume in the case of Fe, Ni, Co, and the solid solutions Ni&sngbnd;Si, Ni&sngbnd;Cu, Fe&sngbnd;Si. The relative variation of the spontaneous magnetization with pressure is accounted for by the use of band theory.