The 43-year-old is joined by defence coach Kevin Sinfield, who he has worked with at Leicester since 2021.
Borthwick has been favourite to take the role since Eddie Jones was sacked and joins on a five-year contract.
Having worked as Jones’ assistant with Japan and then England, he was expected to take the reins after the 2023 World Cup – but that date was brought forward after the side’s poor run of form, as they won five of 12 Tests in 2022.
Borthwick’s contract will run until the end of 2027 – taking England through two World Cups.
