Dejan (Cyrillic: Дејан) is a South Slavic masculine given name, derived from the Slavic verb dejati, meaning "to act, to do".^[1] The name and the derived surname Dejanović are common among South Slavs.

The name is first recorded in 1325 (1333) for a voevod of king Stefan Uroš.^[2]

Notable people

• Dejan (fl. 1346-66), Serbian magnate
• Dejan Bodiroga, Serbian basketball player
• Dejan Dabović (1944–2020), Yugoslav water polo player
• Dejan Damjanović, Montenegrin footballer
• Dejan Dimitrovski, Macedonian footballer
• Dejan Gluščević (born 1967), Serbian footballer and manager
• Dejan Iliev (born 1995), Macedonian footballer
• Dejan Janković, Serbian footballer
• Dejan Kelhar, Slovenian footballer
• Dejan Kulusevski, Swedish footballer of Macedonian descent
• Dejan Lovren, Croatian footballer
• Dejan Medaković (1922–2008), Serbian art historian, writer and academician
• Dejan Meleg, Serbian footballer
• Dejan Milojević (1977–2024), Serbian basketball player and coach
• Dejan Petković (born 1972), Serbian football player
• Dejan Petković (born 1958), Serbian singer
• Dejan Savić, Serbian water polo player and coach
• Dejan Savićević, Montenegrin footballer
• Dejan Stanković, Serbian footballer and manager
• Dejan Stefanović, Serbian footballer
• Dejan Stojanović, Serbian poet, writer, essayist, philosopher, businessman and journalist
• Dejan Tomašević, Serbian basketball player
• Dejan Udovičić, Serbian water polo coach
• Dejan Đedović, Serbian futsbal coach