Peter Rycroft (born October 1993),[1] known professionally as Lostboy, is a British songwriter and music producer.

In 2023, he co-wrote Calvin Harris' single "Miracle" which spent 8 weeks at No.1 in the UK,[2] and produced and co-wrote Kylie Minogue's 2023 hit single "Padam Padam", for which he won the Grammy Award for Best Pop Dance Recording.

Fraser T. Smith got ahold of Lostboy's demo, and invited him to do additional production on songs for Anne-Marie and Gavin James.

He also co-wrote and produced the song "Rise" by Freya Ridings for the teen comedy film Ruby Gillman, Teenage Kraken.

[6][7] The single is Minogue's first to break into the UK top 10 since 2011,[8] and her first ever to chart on the Billboard Hot Dance / Electronic Song list, peaking at Number 10.