David Marcus

David Marcus may refer to:
 * Mickey Marcus (David Daniel Marcus, 1901–1948), American-Israeli soldier
 * David Marcus (writer) (1924–2009), Irish Jewish editor and writer
 * David A. Marcus (born 1973), American entrepreneur, co-creator of Facebook's Diem
 * David Marcus (equestrian) (born 1980), Canadian Olympic dressage rider
 * David Marcus (Star Trek), a character in Star Trek