Costanzo Boni (born November 16, 1972 in Napoli) is a retired Italian pilot who won the WHRC in 1998 and 1999, becoming the first from his country to do so.
Boni made his WHRC debut in 1997 (after having become the first ever HR2 champion in 1994) piloting a Kawasaki and scored 2 points during the season. Then, after Hank Bond-Hale retired temporarily at season's end, the Italian became the first champion of the post-Bond-Hale era in 1998, defeating Canadian and fellow HR2 champion Henry Chiappe by a narrow margin.
Boni defended his title in 1999 with more wins than in 1998 and raced in the Championships until 2005, not reaching the top spot again.
The next Italian to become a WHRC champion was Giuseppe 'Nino' Iadanza who won the title in 2011, 2012 and 2014.