The operator signed a three-year-deal in 2017 and has decided to agree to a further five with the prestigious event.
The Grand National is not the only major horseracing event Betway sponsors, as it has been the official sponsor of the Queen Mother Champion Chase at the Cheltenham Festival since 2015.
Anthony Werkman, Betway CEO, said: "The Randox Health Grand National Festival is a fantastic event and we couldn’t be happier with how the last two years have gone.
"The racing over the three days is of the highest quality and we’re delighted to be continuing our involvement for a further five years."
Dickon White, Regional Director for Jockey Club Racecourses North West, said: "Over the past seasons, Betway has brought tremendous energy and enthusiasm to its role as official betting partner of the Randox Health Grand National Festival and we look forward to continuing to work alongside all the Betway team."
