Mark Dalton is a fictional character from the ABC Daytime soap opera, All My Children. He was portrayed by Mark La Mura. He debuted in 1976 and remained a permanent character until 1989 when he left Pine Valley for a job in China. Mark made special guest appearances in 1994, 1995, 2004, and 2005. Mark Dalton's significant storylines are his failed romance with his half-sister Erica Kane in the 1970s and of substance abuse, including with risks of HIV and AIDS, in the 1980s. La Mura earned a Daytime Emmy Award nomination in 1988 for Best Supporting Actor.