Thomas Benjamin Grennan (born 8 June 1995) is an English singer and songwriter from Bedford, based in London. Grennan found fame as the guest vocalist on Chase & Status's "All Goes Wrong" in 2016. His debut album, Lighting Matches, was released in July 2018. The album peaked at number five on the UK Albums Chart and includes the single "Found What I've Been Looking For".

His second album Evering Road was released in March 2021, beginning his breakthrough in the UK by charting at number one on the UK Albums Chart and including the commercially successful singles "This Is the Place", "Little Bit of Love", "Let's Go Home Together" with Ella Henderson and "Don't Break the Heart". In 2021 and 2022, he was also featured as a guest vocalist on the top-ten singles "By Your Side" with Calvin Harris and "Not Over Yet" with KSI. In 2023, Grennan released his third album What Ifs & Maybes, which became his second UK number one album. It included the top-forty singles "Remind Me", "All These Nights" and "Here" plus the top-twenty singles "How Does It Feel" and "Lionheart (Fearless)" with Joel Corry.