The prime minister’s mother, Charlotte Johnson Wahl, has died aged 79.
A notice published in the Times newspaper said she died “suddenly and peacefully” at St Mary’s Hospital in west London.
Boris Johnson once described his mother, who was a painter, as the “supreme authority” in the family.
Senior figures from across the political spectrum, including Labour leader Sir Keir Starmer, have sent their condolences to Mr Johnson.
Sir Keir tweeted: “I’m very sorry to learn of the prime minister’s loss. My condolences to him and his family.”
Conservative party chairwoman, Amanda Milling, said she was “thinking of Boris Johnson and his family this evening”, adding, “Our thoughts and prayers are with you.”
