Nicolaj is a masculine given name. People with that name include the following:

• Nicolaj Agger (born 1988), Danish footballer
• Nicolaj Charles Sofus Clausen (1900 – 1989), Danish boxer known as Nick Clausen
• Nicolaj Bo Larsen (born 1971), Danish cyclist
• Nicolaj Hansen (1855 - 1932), Danish composer
• Nicolaj Jensen (born 1995), Danish video game player known by his in-game name, "Jensen" (Jensen (video game player))
• Nicolaj Køhlert (born 1993), Danish footballer
• Nicolaj Kopernikus (born 1967), Danish actor
• Nicolaj Laegsgaard (born 1996), Danish cricketer
• Nicolaj Madsen (born 1988), Danish footballer
• Nicolaj Rasted (born 1985), Danish musician
• Nicolaj Ritter (born 1992), Danish footballer
• Nicolaj Schröder (born 1980), Swedish entertainer known as Nic Schröder
• Nicolaj Siggelkow, American economist
• Nicolaj Thomsen (born 1993), Danish footballer

• Carl Christian Nicolaj Balle (1806–1855), Danish composer
• Peter Nicolaj Arbo (1768 – 1827), Norwegian businessman

• All pages with titles beginning with Nicolaj
• All pages with titles containing Nicolaj
• Nicola (name)
• Nicolae (name)
• Nicolai (given name)
• Nicolao
• Nicolas (given name)
• Nicolau
• Nicolau (surname)
• Nicolay
• Nikolaj