Diego Lizardi Marcial (October 10, 1975 – February 21, 2008) was a Puerto Rican athlete specialized in gymnastics.
During his career, Lizardi represented Puerto Rico in several international tournaments including two Summer Olympic Games.
In 2003, he was selected as Puerto Rico's flag bearer for the 2003 Pan American Games held at Santo Domingo, Dominican Republic.
At the time, he was working to open another gymnastics school for kids in Puerto Rico's third largest city, Ponce.
Hundreds of Puerto Ricans attended funeral services at the Puerto Rico Olympic Headquarters in Old San Juan where, in the presence of Lizardi's widow and parents, acting Governor Fernando Bonilla declared him to be Puerto Rico's "Eternal Standard-Bearer" ("El Eterno Abanderado") and then Puerto Rico Senate President Kenneth McClintock made a commitment to appropriate the funds necessary to hold the International Gymnastics Competition that Lizardi proposed to hold in 2009 in San Juan in his last conversation with McClintock's wife, San Juan Sports and Recreation Director María Elena Batista.