Nicolay may refer to:

• Nicolay (musician), Dutch musician
• Nicolay de Caveri, Genoese cartographer
• Nicolay (family), an influential French family in the 15th to 18th centuries

People with surname Nicolay:

• Christian Nicolay (born 1976), German javelin thrower
• Franz Nicolay, American musician and composer
• Jean Nicolay (born 1937), former Belgian football goalkeeper
• John George Nicolay (1832—1901), American biographer and secretary of Abraham Lincoln
• Louis Nicolay, Belgian sports delegate
• Ludwig Heinrich von Nicolay (1737–1820), Russian-German poet, librarian, and president of the St. Petersburg Academy of Sciences
• Mary Ann Nicolay (1850-1939) Matron, UK Nightingale Trainee and Boer War Nurse from Western Australia
• William Nicolay (1771—1842), British soldier

• Nicholas
• Nicola (name)
• Nicolae (name)
• Nicolai (given name)
• Nicolaj
• Nicolao
• Nicolas (given name)
• Nicolau
• Nicolau (surname)