S. Antonius Budi Ariantho (born 3 October 1973), also known as Antonius Ariantho or Antonius Irianto, is a retired Indonesian badminton player who specialized in men's doubles.

During the 1990s he shared numerous international titles with his regular partner Denny Kantono including the French (1993); Hong Kong (1993); Denmark (1994); Thailand (1994); Chinese Taipei (1995, 1996); and Indonesia (1996) Opens; and the (now defunct) Badminton World Cup (1996) and World Badminton Grand Prix (1998) events.

They were runners-up at the prestigious All-England Open in 1995, and bronze medalists at the 1996 Olympics in Atlanta.

Ariantho competed in badminton at the 1996 Summer Olympics in men's doubles, with Denny Kantono, and won a bronze medal.

[1][2] They lost in semifinals against Cheah Soon Kit and Yap Kim Hock, of Malaysia, 15–10, 15–4,[3] and in the bronze medal match they defeated Soo Beng Kiang and Tan Kim Her, of Malaysia, 15–4, 12–15, 15–8.