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.
Nine days after disaster, two pulled alive from Nepal hydropower tunnel
Two people were pulled out alive on Friday from a tunnel linked to a hydropower station on the Trishuli River in Nepal, nine days after an ice, rock and mud slide swept through its valley, killing more than 1,200 people and displacing tens of thousands.
Air India sack Phuket-Delhi pilot who failed drug test
The pilot-in-command of an Air India flight from Phuket to New Delhi that dropped nearly 300 feet last month, injuring several passengers, has been dismissed after testing positive for a psychoactive substance.
Wildfires spread near Indonesia's new capital, prompting calls for action
Wildfires have begun spreading near Indonesia's under-construction new capital, prompting project authorities to urge the disaster mitigation agency to carry out cloud-seeding and water-bombing operations, officials said.
Philippine court issues warrant for VP Duterte's arrest in grave threats case
A Philippine court on Friday ordered the arrest of Vice President Sara Duterte in connection with a criminal case accusing her of making threats against President Ferdinand Marcos Jr., the first lady, and a former House speaker.
Typhoon Saudel brings torrential rain, flooding to China's coastal areas
China's southern coastal provinces of Fujian and Guangdong braced for further torrential rain on Friday, after severe downpours linked to Typhoon Saudel triggered flooding in urban and rural areas, swamping vehicles and causing a three-storey brick building to collapse.
US investigates deadly strike on Iranian wedding
US Vice President JD Vance said that an investigation was being carried out into a deadly strike on an Iranian wedding on Tuesday that an analysis showed likely resulted from a direct hit by the United States' munition.
India food safety crackdown targets company of Nepal's 'Noodle King'
India on Friday ordered a Nepali billionaire's company popular for its Wai Wai noodles to discontinue some products after an investigation found its factory used unhygienic "floor-collected, broken noodles" in making its Indian snacks.
Nepal flood losses estimated at $2.56 billion, official says
Property, housing and infrastructure worth at least $2.56 billion (387.5 billion Nepalese rupees) were damaged in Nepal's catastrophic floods last week, according to the country's disaster authority chief.
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Pinoy Expat Corner
Why is it important for them to preserve Ilokano culture and traditions even while living far from the Philippines?
Pinoy Expat Corner
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Pinoy Expat Corner
What is their mission and vision for Filipinas in Sharjah and across the other emirates?
