Anthony Salvatore Castonzo (born August 9, 1988) is an American football offensive tackle with the Indianapolis Colts of the National Football League. After a college career at Boston College, Castonzo was selected by the Indianapolis Colts with their first round draft pick in the 2011 NFL Draft.
Fork Union Military Academy in Virginia, where he was a two-way tackle for the Blue Devils and also saw action at the tight end spot. He previously attended Lake Zurich High School in Lake Zurich, Illinois, where he protected quarterback Matt Blanchard.
Considered a two-star recruit by
, Castonzo ranked No. 44 among prep school prospects in 2007. Rivals.com He did not have any scholarship offers when he finished high school. 
Becoming the first
true freshman to start on the Boston College offensive line since Paul Zukauskas in 1998, Castonzo helped hold opponents to only 61 tackles-for-loss (fifth in the nation) and 22 quarterback sacks in 2007. By protecting quarterback Matt Ryan at right tackle, he helped pave the way for the Eagles' 5,924 yards in total offense. Castonzo subsequently received All-ACC Freshman honors by and Freshman All-American honors by the The Sporting News . Football Writers Association of America
Prior to his sophomore season, Castonzo made the move from right tackle to left tackle where he started all 14 games in 2008. Boston College ranked 25th in the country in tackles for a loss allowed (4.77) and 49th in sacks allowed (1.69). Castonzo earned a
All-Sophomore First Team selection. College Football News
In 2009, Castonzo was listed at No. 9 on
preseason offensive tackle power ranking. Rivals.com′s Following a productive junior season, Castonzo was selected 2009 First Team All-Atlantic Coast Conference as voted on by the 40 members of the Atlantic Coast Sports Media Association.
Castonzo was selected by the
Indianapolis Colts with the 22nd pick overall of the 2011 NFL Draft. He was the third offensive tackle off the board, after Tyron Smith and Nate Solder.
He became the Colts starting left offensive tackle for the 2011 season. He started 12 games during his rookie season and the Colts finished 2-14 without longtime starting quarterback
, Rivals.com, January 31, 2007 Prep School Top 50 2007 , http://rivals100.rivals.com/viewrank.asp?ra_key=1669
"Carimi, OL prospects ready for NFL combine tests". Boston.com. February 24, 2011 . http://www.boston.com/sports/football/articles/2011/02/24/carimi_ol_prospects_ready_for_nfl_combine_tests/ . Retrieved March 2, 2011.
, FWAA, January 7, 2008 AON Insurance/FWAA Freshman All-America Team 2007 , http://www.sportswriters.net/fwaa/news/2007/allamerica080107.html
Cirminiello, Richard (December 11, 2008), "2008 CFN All-Sophomore Team", College Football News , http://cfn.scout.com/2/820628.html
Buchanan, Olin; Dienhart, Tom; Fox, David; Huguenin, Mike; Megargee, Steve (August 22, 2009), "Preseason offensive tackle power rankings", Rivals.com , http://rivals100.rivals.com/content.asp?cid=978914