The clay-court tournament will take place from 7-18 July, after the showpiece event of the calendar: Wimbledon, which starts next week.
It was only last month when Betway was confirmed as the sponsor of Swedish tennis tournament, the Nordea Open.
The event will run alongside the Hamburg Open, as it starts on 5 July and ends on 18 July.
The operator now sponsors a series of tennis events, including the Miami Open, Noventi Open and the Mercedes Cup.
As part of the latest partnership, Betway’s brand will be visible courtside and digitally across the Rothenbaum Tennis Center.
Betway CEO, Anthony Workman, said: “We’re thrilled to be partnering with Hamburg Open as we become their Official Betting Partner.
“The tournament is a highlight of the summer clay circuit and we’re looking forward to seeing the Betway brand at the Rothenbaum Tennis Center.”
Tournament Director, Sandra Reichel, added: “We’re delighted to announce this partnership, especially in these unusual times, and I think it's tremendous that they're sponsoring the overall event in both the women's and men's tournament weeks.
“Besides being highly respected in its industry, Betway shares our commitment to creating a safe environment for customers. This was important to us when choosing a partner.”
In April, news broke that Super Group, Betway's parent company, is closing in on a deal to go public at a valuation of around $5.1bn (£3.7bn).
