He was called up to the senior England squad by Eddie Jones for their 2017 summer tour of Argentina and played as part of the 2018 Six Nations squad. On 12 August 2019, Underhill was named in Eddie Jones' 31-man Rugby World Cup squad. He was one of the stars of the semi-final victory over New Zealand, helping England to reach their first World Cup final since 2007. With England he has won the Six Nations Championship and The Autumn nations cup, both in 2020.