It's after the resignation of Edouard Philippe who has been in the post for three years.
Mr Castex, 55, is relatively unknown in France, although he is a senior civil servant.
The new Prime Minister has been a key player in the government's response to the Covid-19 pandemic.
Four killed, 10 wounded in California shooting
Four people died after 14 people were shot at a family gathering in Stockton in northern California on Saturday night, police said.
Global airlines race to fix A320 jets after Airbus recall
Global airlines scrambled on Saturday to fix a software glitch on their Airbus A320 jets as a recall by the European planemaker temporarily grounded aircraft in Asia and Europe and threatened travel in the US during the busiest weekend of the year.
Death toll in Sri Lanka rises to 153 after Cyclone Ditwah
At least 153 people have been killed in Sri Lanka after landslides and flooding caused by Cyclone Ditwah, officials said on Saturday, with 191 others missing and more than half a million affected nationwide.
Hong Kong mourns victims of blaze that killed 128 and counting
Hong Kong on Saturday mourned the 128 people known to have died in a massive fire at a high-rise apartment complex, a toll that is likely to rise with 200 others still unaccounted for days after the disaster.
Vast Russian overnight attack on Ukraine kills two, wounds dozens
A vast Russian overnight attack on Ukraine killed two people and wounded two dozen, Ukraine's foreign minister said on Saturday, adding that Moscow continued to "kill and destroy" while the world was discussing peace plans for the conflict.
President His Highness Sheikh Mohamed bin Zayed Al Nahyan has said that Commemoration Day, on November 30, is a cherished national occasion on which the nation honours the memory of its courageous heroes who gave their lives for the UAE, exemplifying the highest ideals of sacrifice in defence of their country and its values.
His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, said that on Commemoration Day the spirit of patriotism fills the hearts of all Emiratis, and the nation takes pride in the sacrifices of its martyrs.
The UAE’s fuel price committee has announced the petrol and diesel rates for December 2025, confirming an increase across all categories.
