Spanish director Pedro Almodovar's first English-language movie "The Room Next Door", which tackles the hefty themes of euthanasia and climate change, won the prestigious Golden Lion award at the Venice Film Festival on Saturday.

Starring Tilda Swinton and Julianne Moore, the film received an 18-minute standing ovation when it premiered at Venice earlier in the week – one of the longest in recent memory.

Almodovar is a darling of the festival circuit and was awarded a lifetime achievement award at Venice in 2019 for his bold, irreverent and often funny Spanish-language features.

He also won an Oscar in the best foreign language category for his 1999 film "All About My Mother".

Now aged 74, he has decided to try his hand at English, telling reporters that it was like science fiction for him.

Speaking ahead of the premiere, he said his movie highlighted the importance of cherishing life, but also made clear that people should be able to die with dignity at a time of their choosing.

While "The Room Next Door" had been widely tipped to win, the runner-up Silver Lion award was a surprise, going to Italian director Maura Delpero for her slow-paced drama set in the Italian Alps during the second world war – "Vermiglio".

Australia's Nicole Kidman won the best actress award for her risque role in the erotic "Babygirl", where she plays a hard-nosed CEO, who jeopardises both her career and her family by having a toxic affair with a young, manipulative intern.

Kidman was in Venice on Saturday, but did not attend the awards ceremony after learning that her mother had died unexpectedly.

France's Vincent Lindon was named best actor for "The Quiet Son", a topical, French-language drama about a family torn apart by extreme-right radicalism.

The best director award went to American filmmaker Brady Corbet for his movie "The Brutalist", the epic tale of a Hungarian Holocaust survivor played by Adrien Brody, who seeks to rebuild his life in the United States.

The festival marks the start of the awards season and regularly throws up big favourites for the Oscars, with eight of the past 12 best director awards at the Oscars going to films that debuted at Venice. (Reuters)