Viðar Örn Kjartansson (; born 11 March 1990) is an Icelandic professional footballer who plays as a striker for Super League Greece club Atromitos. Club career Viðar made his debut for Selfoss in 2006, aged 16. He joined Icelandic top division club ÍBV in 2009 but rejoined Selfoss after a short stint with ÍBV. He joined Icelandic club Fylkir in 2013 and after a very prolific goalscoring season in the Icelandic top flight, he joined Norwegian club Vålerenga in December 2013. Viðar scored his first goal for Vålerenga in a 3–1 home win over Bodø/Glimt on 6. April 2014. After his first year in Norway, Viðar ended up as the top scorer in the Norwegian top league with 25 goals scored in 29 games. On 22 January 2015, Viðar transferred to Chinese Super League side Jiangsu Guoxin-Sainty. Jiangsu Guoxin-Sainty signed him for €3.5 million. On 7 March 2015, he made his debut and scored his first goal for Jiangsu in the first league match of the 2015 season which Jiangsu Sainty lost to Shanghai SIPG 2–1. Viðar played a vital part in the Chinese FA cup, and was the club's top goalscorer in the cup with four goals, which helped Jiangsu to win their first trophy in history of the club. On 27 January 2016, he signed for Swedish club Malmö FF. On 30 August 2016, he transferred to Israeli club Maccabi Tel Aviv. He signed a four-year deal with the club. On 26 October 2016, Viðar won the Swedish championship as Malmö FF sealed the title in his absence. On 31 August 2018, he signed a four-year contract with the Russian Premier League club FC Rostov, joining his compatriots Ragnar Sigurðsson, Björn Bergmann Sigurðarson and Sverrir Ingi Ingason at the club. He scored his first two goals for the club on 26 September 2018 in a Russian Cup 4–0 victory over a third-tier club FC Syzran-2003. On 18 March 2019, Viðar signed a five-month loan deal with Hammarby IF in Allsvenskan. On 20 July 2019, he joined Russian club FC Rubin Kazan on loan for the 2019–20 season. He played 16 league games and scored one goal during the first half of the season, as Rubin Kazan was placed 13th in the table, before terminating his loan deal on 11 January 2020. On 27 January 2020, Rostov announced that he was loaned to Turkish club Yeni Malatyaspor. On 28