Grimes follows in the footsteps of other recent key appointments, including Rob Fell as Vice President of Product and Lucky Multani as Chief Operating Officer.
Grimes joins the company after previously working as Head of Casino at Gala Coral Interactive.
Nigel Birrell, CEO of Lottoland, said: "Gavin's expertise and know-how will be of huge importance to us as we extend our product offering into more traditional online gaming," said Lottoland CEO Nigel Birrell. "Gavin has an outstanding track record and we're delighted to have him on-board."
Grimes has spent 17-years working in the online gaming sector, with prior roles including Head of Social Gaming at Gala Coral, Managing Director of marketing agency McBroom and Head of Marketing at Cantor Index.
"There are few companies in the world, let alone online gaming, growing as fast as Lottoland," Grimes said. "I'm very excited to be a part of their continued development and look forward to helping the business diversify. Lottoland is perfectly poised to expand their product offering and I'm very excited at the prospect of helping them become leaders in online gaming as well as lottery betting."