The Nets will be making their third trip to London. They played a preseason game there in 2008 and then two regular season games against the Toronto Raptors in 2011.
This will be the Hawks' first time playing a regular-season game outside of North America. They played a pair of preseason games in London in 1993.
"We are very excited to once again represent the NBA in London," Nets general manager Billy King said in a statement. "The fans have always been very supportive, and we look forward to once again entertaining them with Brooklyn Nets basketball."
The NBA also announced the San Antonio Spurs will take on the Minnesota Timberwolves on Dec. 4 in Mexico City, marking the first time the NBA will stage regular-season games in two countries outside of the U.S. and Canada in the same season.
"Given the deep-rooted Mexican heritage of San Antonio and our proximity to the Mexican border, Mexico City is an ideal location for us to play our first regular-season game outside of the United States and Canada," said Rick Pych, the Spurs' president of business operations.
Nets-Hawks will be the 12th game London has hosted since 1993.
"Playing in London will be a special experience for our players and coaches, and we are proud to represent Atlanta in front of an international audience," Hawks president and GM Danny Ferry said in a statement.
Tickets for the Nets-Hawks game can be purchased beginning in October.