|National team||Great Britain|
|Born||17 September 1997|
Crewe, Cheshire, England, United Kingdom
|Height||1.84 m (6 ft 0 in)|
|Weight||66 kg (146 lb)|
|Club||Cockermouth Swimming Club, Cockermouth, Cumbria|
|Coach||Sean Balmer, Eleanor Walsh|
He won two gold medals in (200 m, 100 m backstroke) and breaking a new Junior World record in 200 m backstroke at the 2015 European Games.
In 2014, at the 2014 European Junior Championships, Greenbank won gold medal in 200 m backstroke. He then competed at the 2014 Youth Olympics in Nanjing taking bronze in 200 m backstroke and gold in 4 × 100 m freestyle (with Duncan Scott, Miles Munro, Martyn Walton).
In June 2015, Greenbank competed at the inaugural 2015 European Games in Baku, He won 2 gold medals in (200 m, 100 m backstroke) and breaking a new Junior World record in 200 m backstroke at the 2015 European Games clocking in 1:56.89. He also took silver medals in 4 × 100 m medley (with Duncan Scott, Charlie Attwood, Charlie Attwood) and in 4 × 100 m mixed medley.
Greenback won his first World Championships medal at the 2019 World Aquatics Championships held in Gwangju, South Korea. He finished third in the men's 200m backstroke, setting a personal best time. He was part of the team in the men's 4 × 100 metre medley relay together with Adam Peaty, James Guy and Duncan Scott. He started the race in the backstroke leg, and the team finished in a European record time of three minutes, 28.10 seconds to beat the United States, and won their first gold medal in the event in the World Championships.
- "Luke Greenbank Sets World Junior Record in 200 Back in Baku". swimmingworldmagazine.
- "Commonwealth Games: Ben Proud claims gold, Caster Semenya breaks record". BBC Sport. 10 April 2018.
- "World Aquatics Championships: Luke Greenbank wins 200m backstroke bronze". BBC Sport. 26 July 2019.
- Field, Pippa (28 July 2019). "Adam Peaty: Winning relay world title with Great Britain 'better than Olympic gold'". The Telegraph.