Reece James William Topley (born 21 February 1994) is an English international cricketer who plays for the England cricket team in white ball cricket as a left-arm fast medium bowler. He plays for Surrey in domestic cricket. Topley debuted for England in August 2015 against Australia, and represented the team at both the 2016 ICC World Twenty20 and 2023 Cricket World Cup. He plays for the Mumbai Indians in the Indian Premier League.

He was born on 21 February 1994 in Ipswich. He was educated at the Royal Hospital School. His father, Don Topley, was a first-class cricketer for Essex and Surrey. His father was also one of his teachers at Royal Hospital School, where he is a master of cricket. His uncle, Peter Topley, was also a first-class cricketer.

In June 2009, aged 15, Topley made the headlines when he was injured bowling in the nets at Loughborough University to England batsman Kevin Pietersen. Pietersen flat drove a delivery, which ended up striking Topley on the side of the head, knocking him to the ground. He was taken to Leicester Royal Infirmary where he required stitches to his ear and was kept in hospital overnight. Following the incident, Pietersen, whom Topley cited as his favourite player, gave the youngster his cricket bat with his signature on.

A product of the Essex youth cricket system, Topley made his first-class debut for Essex against Cambridge MCCU in the 2011 season. He impressed on County Championship debut against Kent, taking his maiden five wicket haul when he took figures of 5/46 in Kent's second-innings of the match. In the following championship match against Middlesex he his second five wicket haul, with figures of 5/64 in Middlesex's first-innings. In May 2011, he signed a one-year professional contract with Essex. That month also saw Topley make his List A debut against the Unicorns in the Clydesdale Bank 40, with Topley claiming his maiden wicket in that format, that of Robin Lett.

Mid-season Topley took a break from county cricket to return to Royal Hospital School to revise for his summer exams. However, during his break he was called up to play for England Under-19s for their Youth One Day International series against South Africa Under-19s. He returned to action for Essex in August, to date he has played two List A matches and nine first-class matches. He has made a good start to his first-class career, taking to date 34 wickets at an average of 23.55. The start to his career drew praise from former England captain Michael Vaughan, who stated that Topley could become a future Test cricketer.

On 1 September 2015, Hampshire County Cricket Club confirmed the signing of Topley from Essex at the end of the 2015 season. At the end of the 2018 season and yet another stress fracture, Topley underwent back surgery.

In IPL 2021, he was asked for being a replacement for injured Josh Hazlewood by Chennai Super Kings, but he denied the offer as the cricketer feared by the hike of COVID-19 cases in India. In 2021, he was drafted by Oval Invincibles for the inaugural season of The Hundred. In December 2021, he was signed by Islamabad United following the players' draft for the 2022 Pakistan Super League.

In April 2022, he was bought by the Oval Invincibles for the 2022 season of The Hundred.