The daytime host, who has seen a ratings hit after allegations of running a toxic workplace, has decided that the upcoming 19th season will be the last, ending in 2022. It coincides with the end of her contract.

"Although all good things must come to an end, you still have hope that the truly great things never will," Mike Darnell, president of unscripted TV for Warner Bros, said in a statement.

"It was and is an indelible piece of the television landscape, and it will be sorely missed."

In an interview with The Hollywood Reporter, which broke the news, DeGeneres said that "as great as this show is, and as fun as it is", it was no longer a creative challenge.

The Ellen DeGeneres Show, which started airing in 2003 and is distributed by Warner Bros, has a mix of dancing, games and giveaways along with A-list celebrities.

But the host, who built her brand on the motto "Be kind", opened season 18 in September with a lengthy apology.

Three of the show's producers exited over the summer amid allegations of a dysfunctional workplace that harbored misbehaviour, including sexual misconduct and racially insensitive remarks.

While the allegations were "very hurtful to me" they did not influence her decision to leave the show, DeGeneres told The Hollywood Reporter.

Nielsen data shows The Ellen DeGeneres Show viewership dropped by 1.1 million people this season, from 2.6 million viewers.

DeGeneres said her post-show plans were uncertain. She was open to movie roles and wanted to be more involved in environmental conservation efforts.

DeGeneres's scripted TV show Ellen became a landmark in TV history in the 1990s when her character came out as gay.

Australian Associated Press