Confirming the news, tournament director Ralf Weber said that they are looking forward to the return of Federer, who had played a pivotal role in the making the tournament popular worldwide.
"We are looking forward to Roger's return. He has finally helped bring the tournament into a new dimension and made it even more popular worldwide," Sport24 quoted Weber as saying.
Besides Swiss maestro Federer, eight of the top 20 players in the world will feature in Halle including last year's runner-up Alexander Zverev, who won the Munich clay-court ATP tournament last week.
The grass-court tournament, which is traditionally a warm-up for Wimbledon, is slated to be held from June 17 and runs until June 25.