Memo is a nickname, often of Guillermo. People with the nickname include:
Memo Acevedo, Colombian-born Canadian-American jazz drummer, percussionist, composer, arranger, bandleader and educator Memo Benassi (1886–1957), Italian film actor Memo Gidley (born 1970), Mexican-American race car driver Guillermo Gonzalez (soccer) (born 1986), American soccer player Guillermo Gracida Jr. (born 1956), Mexican polo player Ángel Guillermo "Memo" Heredia Hernández (born 12 February 1975), Mexican former discus thrower and sports coach known for his involvement in the BALCO scandal Memo Luna (born 1930), Mexican baseball player Guillermo Ochoa (born 1985), Mexican soccer player Mehmet Okur (born 1979), Turkish basketball player Memo Rojas (born 1981), Mexican race car driver Guillermo Valencia (footballer), Colombian football player and coach