Marcelo Alejandro Otero Larzábal (born 14 April 1971 in Montevideo) is a retired Uruguayan football player. He was nicknamed "Marujo" during his career, and is the younger brother of Raul Otero.
Otero played in Uruguay for Rampla Juniors and Peñarol, in Italy for Vicenza, and in Spain for Sevilla. Whilst at Vicenza he won the 1996–97 Coppa Italia.
Otero made his debut for the Uruguay national football team on October 19, 1994 in a friendly match against Peru (0-1 win) in the Estadio Nacional José Díaz in Lima, Peru. His older brother Raúl, a defender, earned his first cap in the same game. He was also part of the Uruguayan national side that won the Copa América 1995.