Valentin Adama Diomande (born 14 February 1990) is a Norwegian professional footballer who plays as a striker for Major League Soccer club Los Angeles FC. He has previously played for Lyn, Skeid, Hødd, Strømsgodset, Dinamo Minsk, Stabæk, and Hull City.
Diomandé was born in Oslo to parents from the Ivory Coast. He played youth football for the clubs Holmlia, Vålerenga and Lyn. He has attended the sport secondary school Norges Toppidrettsgymnas, like most of Lyn's young players. He initially studied sports' science at Ulsrud School.
Diomandé made his senior début on 19 October 2008 against Hamarkameratene, as a substitute in the 86th minute. He played one more game in 2008 and one in 2009. Ahead of the 2010 season he joined Skeid.
On 26 March 2015, Diomandé signed a 2.5-year contract with Stabæk.
On 1 September 2015, Diomandé joined English Championship club Hull City for a fee of £1.7 million. Because of injury he had to wait until 12 December 2015 to make his debut when he came off the bench, as a 77th-minute replacement for Chuba Akpom, in the 1–0 home win against Bolton Wanderers. Diomandé made his Premier League debut on 13 August 2016, scoring a spectacular overhead kick in a shock 2–1 defeat of reigning champions Leicester City.
Diomandé received his first international call-up to the senior team in June 2015, making his début for the senior team on the 12th when he came on as a substitute for Joshua King in the 79th minute of a goalless UEFA Euro 2016 qualifying draw against Azerbaijan at Ullevaal Stadion.