Gundam Build Fighters (ガンダムビルドファイターズ, Gandamu Birudo Faitāzu), often abbreviated as GBF, is a 2013 Japanese science fiction anime television series based on Sunrise's long-running Gundam franchise. The series is directed by Kenji Nagasaki of No. 6 and written by Yōsuke Kuroda of Mobile Suit Gundam 00. Character designs were done by both Kenichi Ohnuki and Suzuhito Yasuda. The series was first unveiled under the name "1/144 Gundam Mobile" project by Sunrise, before its official announcement. In contrast to other Gundam series, Gundam Build Fighters focuses on the Gundam model (Gunpla) aspect of the franchise.

The series was officially unveiled by Bandai on July 2, 2013, during the series's live press conference as part of Gundam's 35th anniversary in 2014. It premiered on TXN stations in Japan and on YouTube in limited international markets on October 7, 2013. One Manga adaptation and two photonovels were also announced by Sunrise, and currently running on Gundam Ace (Gundam Build Fighters Amazing), Hobby Japan (Gundam Build Fighters Honno), and Dengeki Hobby Magazine (Gundam Build Fighter Document) magazines.

Gundam Build Fighters is followed by the 2014 sequel Gundam Build Fighters Try. A sequel ONA titled Gundam Build Fighters: GM's Counterattack (ガンダムビルドファイターズ GMの逆襲, Gandamu Birudo Faitāzu GM no Gyakushū), which takes place between Build Fighters and Build Fighters Try, was released on August 25, 2017.