Kostas Sloukas|  | 
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| Position | Point guard / shooting guard | 
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| League | GBL EuroLeague
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| Born | (1990-01-15) January 15, 1990 Thessaloniki, Greece
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| Listed height | 1.90 m (6 ft 3 in) | 
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| Listed weight | 90 kg (198 lb) | 
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| NBA draft | 2012: undrafted | 
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| Playing career | 2008–present | 
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| 2008–2015 | Olympiacos | 
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| 2010–2011 | →Aris Thessaloniki | 
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| 2015–2020 | Fenerbahçe | 
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| 2020–2023 | Olympiacos | 
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| 2023–present | Panathinaikos | 
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| 4× EuroLeague champion (2012, 2013, 2017, 2024)EuroLeague Final Four MVP (2024)All-EuroLeague First Team (2019)2× All-EuroLeague Second Team (2022, 2024)EuroLeague 50–40–90 club (2019)EuroLeague Magic Moment of the Season (2022)FIBA Intercontinental Cup champion (2013)3× Τurkish Super League champion (2016–2018)3× Turkish Cup winner (2016, 2019, 2020)2× Turkish Super Cup winner (2016, 2017)Turkish All-Star (2017)5× Greek League champion (2012, 2015, 2022–2024)4× Greek Cup winner (2010, 2022, 2023, 2025)Greek Super Cup winner (2022)Greek League MVP (2024)4× All-Greek League First Team (2015, 2022– 2024)Greek League Best Young Player (2011)Greek Cup Finals MVP (2025)3× Greek League All-Star (2012, 2013, 2022)3× Greek Youth All-Star Game (2009–2011)2× Greek Youth All Star Game 3 Point Shootout Champion (2010, 2011)
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Konstantinos "Kostas" Sloukas (Greek: Κωνσταντίνος Σλούκας born January 15, 1990) is a Greek professional basketball player and the team captain for Panathinaikos of the Greek Basketball League (GBL) and the EuroLeague. He is also a regular member of the senior Greek basketball national team. A left-handed, 1.90 m (6 ft 3 in) tall combo guard, Kostas Sloukas is one of the most decorated EuroLeague players of his generation.
Sloukas has played in eight EuroLeague Finals (2012, 2013, 2015, 2016, 2017, 2018, 2023 and 2024) winning the title on four occasions (2012, 2013, 2017 and 2024). He was a member of the All-EuroLeague First Team in 2019 and a member of the All-EuroLeague Second Team in 2022 and 2024.
After lifting the EuroLeague trophy in 2024 and earning Final Four MVP honors in the process, Sloukas became just the second player in history to win the competition with three different teams, alongside Sarunas Jasikevicius.