Nicolaus

• Nicolaus Copernicus, Polish astronomer who provided the first modern formulation of a heliocentric theory of the solar system
• Nicolaus Otto, German engineer

• Nicolaus I Bernoulli, Swiss mathematician
• Nicolaus II Bernoulli, Swiss mathematician
• Nicolaus Rohlfs, 18th-century German mathematics teacher who wrote astronomical calendars

• Nicolaus Becker, German lawyer and writer, the author of the Rheinlied
• Nicolaus of Damascus, Greek historical and philosophical writer who lived in the Augustan age

• Nicolaus Bruhns, German composer
• Nicolaus Zacharie, Italian composer of the early Renaissance

• Nicolaus Ludwig Zinzendorf, German religious and social reformer and bishop of the Moravian Church
• Nicolaus Taurellus, German philosopher and theologian
• Nicolaus of Antioch, one of the seven deacons listed in The Acts of the Apostles, chapter 6, verse 5

• Nicolaus Delius, German philologist

  Other uses

• Nicolaus, California, a small town in the United States
• Nicolaus , a genus of leafhoppers