Nicholas I may refer to:
- Pope Nicholas I (c. 820 – 867), or Nicholas the Great
- Nicholas I of Russia (1796 – 1855), Tsar of Russia and King of Poland
- Nicholas Mysticus, patriarch Nicholas I of Constantinople
- Nicholas I of Montenegro (1841 – 1921), king of Montenegro
- Nicolaus I Bernoulli (1687-1759) in Basel; Swiss mathematician
- Nicholas I Garay (died 1386), chief governor of Bratislava, palatine to the King of Hungary
- Patriarch Nicholas I of Alexandria, Greek Patriarch of Alexandria between 1210 and 1243
- Nicholas I, Duke of Troppau, natural son of king Ottokar II of Bohemia, became Duke of Troppau in Silesia
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