The <dfn>Union of Socialist Movements,</dfn> abbreviated as USM (French: Union des mouvements socialistes abbreviated as UMS), is a political party in Cameroon.
It was founded in 2011 by , former vice-president of the Social Democratic Front (SDF).
In March 2022, the political party joined forces with the SDF, the Cameroonian Party for National Reconciliation (PCRN) and the Cameroon Democratic Union (UDC) to form a sixteen-member opposition parliamentary group in the National Assembly called "Union for Change".