Marcelo Cruz Utreras (born Quito 1943) is an Ecuadorian neurologist and politician.
He graduated as a neurologist in the mid-1970s, when he also founded the first Neurology service of Ecuador at the Carlos Andrade Marín Hospital in Quito.
He then went on to work with the research team of the National Polytechnic School and was part of the group of scientists who promoted the law of mandatory iodization of salt to combat endemic goiter and cretinism.
With the support of the CDC, Cruz led a research team that found that the cause of this high prevalence of epilepsy was the invasion of the brain by the T. solium parasite.
He was the vice-presidential nominee of the National Action Institutional Renovation Party (Prian) during the candidacy of Álvaro Noboa in 2002.