Mauricio Valiente Ots (born 1966) is a Spanish lawyer, activist and politician, member of United Left (IU) and the Communist Party of Spain (PCE).

[5][6] In his capacity as lawyer he specialised in the area of asylum seeking, immigration and human rights,[7] and worked for several years at the Comisión Española de Ayuda al Refugiado (CEAR).

[3] Included in the 9th slot of the United Left–The Greens (IU-LV) for the May 2011 regional election, headed by Gregorio Gordo Pradel,[9] he was elected member of the 9th term of the regional legislature (2011–2015),[10] in which he held the attached spokesmanship of the United Left–The Greens parliamentary group in the Commission of Social Affairs.

[11] In November 2014 he presented as IU candidate (in a City Council-regional Government tandem along Tania Sánchez) for the Mayorship of Madrid in an IU-CM internal process.

His candidature, linked to the critic faction, defended the merging of IU-CM with other organizations in the electoral list.