Avellino is an Italian surname. Notable people with the surname include:
Andrew Avellino (1521–1608), Italian saint
Giulio Giacinto Avellino (c.1645–c.1700), Italian painter
Natalie Avellino (born 1970), Australian netballer
Onofrio Avellino (c.1764–1741), Italian painter
Salvatore Avellino (born 1935), Italian mobster and caporegime