The senior from Longview, Texas, had earlier been named to the American Football Coaches Association and Walter Camp Football Foundation teams.
Williams missed the regular season finale 27-0 victory over Oklahoma State with an injury, but still led OU this year with 885 plays and 102 knockdown blocks. He has been a three-year starter for the Sooners.
This marks the sixth time in the past seven seasons that an OU offensive lineman has earned All-America status (Trent Williams, 2009; Duke Robinson, 2008; Duke Robinson, 2007; Jammal Brown, 2004; Vince Carter, 2004; Jammal Brown, 2003).
Williams joins OU defensive tackle Gerald McCoy in making first-team on three different All-America teams in 2009. McCoy was honored by the Walter Camp Football Foundation, Football Writers Association of America and the Sporting News.
Oklahoma has now produced 150 All-Americans in the program's history including 30 first-team honors under head coach Bob Stoops.
No program in the nation has produced more unanimous (31) All-Americans than OU. Oklahoma also has the most consensus All-Americans (69) in the modern era of college football (since World War II).
2009 Associated Press All-America Team