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William T. Tukuafu is an American football fullback. He was signed by the Seattle Seahawks as an undrafted free agent originally in 2010. He has also played for the San Francisco 49ers.

Tukuafu was born in Salt Lake City, Utah. He graduated from East High School, attended Scottsdale Community College in Scottsdale, Arizona, then transferred to the University of Oregon.

Tukuafu was signed by the 49ers on August 12, 2010. He was released on September 3, 2010,​ and was re-signed to the practice squad two days later. He was promoted to the 49ers' active roster on December 18, 2010. He made NFL debut and recorded his first career fumble recovery on his first career play from scrimmage vs. Seattle on September 11, 2011. During his tenure in San Francisco, he saw action in 20 games from 2010-2013 and additionally six career playoff appearances with two starts. His versatility has allowed him to play fullback, defensive line, and on special teams.

At the end of the 2012 season, Tukuafu and the 49ers appeared in Super Bowl XLVII. He appeared in the game on offense, defense, and special teams, but the 49ers fell to the Baltimore Ravens by a score of 34–31.