José Manuel Olivares Marquina (born 19 August 1985) is a Venezuelan politician, oncologist and nuclear medicine physician who served as a deputy of the National Assembly from Vargas from 2016 to 2021.

After graduating in 2010, Olivares spent his mandatory year of military service working in a clinic in Tacarigua de Mamporal, Miranda.

[6] In 2013, he began his postgraduate studies at the Hospital Clínico Universitario in Caracas, specializing in oncology, radiation therapy and nuclear medicine.

Olivares took to the streets in peaceful protest together with other leaders like Yon Goicoechea, Stalin González, Miguel Pizarro, Ricardo Sánchez Mujica, Freddy Guevara and David Smolansky.

Olivares was a candidate of Un Nuevo Tiempo for Vargas state governorship in 2012, supported by other MUD parties; he lost to the incumbent governor Jorge García Carneiro by a large margin.

Olivares used his position to highlight the poor conditions of Venezuelan hospitals, including shortages of medicine and medical and surgical supplies.

Olivares traveled to Washington D.C. to formally petition the World Health Organization to provide medicines in the form of humanitarian aid and to give Venezuela access to the WHO's Strategic Fund.

[11] In addition to legislative action, José Manuel Olivares has been a main organizer of events like the Marcha de los Récipes, where patients marched to the Apostolic Nunciature to Venezuela, demanding access to humanitarian aid.