The 62-year old former USA boss has penned a multi-year deal with the Californian club with whom he first took the reins in 2008.
"We are very pleased to sign Bruce Arena to a multi-year contract extension," said Dan Beckerman President and CEO of Galaxy's owners AEG.
"Bruce is one of the finest coaches in the history of soccer in the United States. His commitment to the LA Galaxy, the club's winning tradition and continued excellence on and off the field is unrivaled.
"We look forward to the team's continued success under Bruce's management."
During his time with the Galaxy, Arena has led the club to the 2011 and 2012 MLS Cups, the 2010 and 2011 MLS Supporters' Shield, the 2009, 2011 and 2012 Western Conference titles and was named the MLS Coach of the Year in 2009 and 2011.
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