Jaan is an Estonian masculine,^[1] a cognate of the English-language given name John.

People named Jaan include:

• Jaan Anvelt (1884–1937), Estonian communist revolutionary
• Jaan Arder (1952–2014), Estonian singer
• Jaan Ehlvest (born 1962), Estonian chess player
• Jaan Eigo (1866–1946), Estonian politician
• Jaan Eilart (1933–2006), Estonian biologist
• Jaan Einasto (born 1929), Estonian astrophysicist
• Jaan Hargel (1912–1966), Estonian conductor, music teacher, oboe player and flautist
• Jaan Eslon (1952–2000), Estonian-Swedish chess player
• Jaan Hünerson (1882–1942), Estonian agronomist and politician
• Jaan Isotamm (1939–2014), Estonian poet
• Jaan Jaago (1887–1949), Estonian wrestler
• Jaan Jung (1835–1900), Estonian educator, archeologist and historian
• Jaan Jüris (born 1977), Estonian ski jumper
• Jaan Kalviste (1898–1936), Estonian chemist, educator, and translator
• Jaan Kaplinski (1941–2021), Estonian poet, philosopher, and culture critic
• Jaan Kärner (1891–1958), Estonian poet and writer
• Jaan Kiivit Sr. (1906–1971), Estonian Archbishop
• Jaan Kiivit, Jr. (1940–2005), Estonian Archbishop
• Jaan Kikkas (1892–1944), Estonian weightlifter
• Jaan Kirsipuu (born 1969), Estonian road bicycle racer
• Jaan Klõšeiko (1939–2016), Estonian printmaker and photographer
• Jaan Kolberg (born 1958), Estonian film director and producer
• Jaan Kokk (1903–1942), Estonian politician
• Jaan Kriisa (1882–1942), Estonian lawyer and politician
• Jaan Kross (1920–2007), Estonian contemporary writer
• Jaan Kruus (1884–1942), Estonian military General
• Jaan Kruusvall (1940–2012), Estonian writer and playwright
• Jaan Kundla (born 1937), Estonian politician
• Jaan Kurn (1893–1981), Estonian teacher, poet and translator
• Jaan Laaman (born 1948), Estonian-born American member of the United Freedom Front
• Jaan Lattik, (1878–1967), Estonian politician and writer
• Jaan Lepp (1895–1941), Estonian track and field athlete and soldier
• Jaan J. Leppik (born 1969), Estonian clergyman and politician
• Jaan Lippmaa (1942–2021), Estonian engineer and politician
• Jaan Lõo (1872–1939), Estonian Supreme Court judge, poet and politician
• Jaan Luik (born 1953), Estonian sculptor
• Jaan Lüllemets (1932–2004), Estonian politician
• Jaan Maide (1896–1945), Estonian Army officer and commander
• Jaan Manitski (born 1942), Estonian politician
• Jaan Mark (born 1951), Estonian politician
• Jaan Masing (1875–1948), Estonian politician
• Jaan Miger (1859–1940), Estonian politician
• Jaan Murro (1903–1969), Estonian editor, journalist and politician
• Jaan Patterson (born 1975), German American writer and composer, founder of the netlabel Surrism-Phonoethics
• Jaan Pehk (born 1975), Estonian writer, singer and guitarist
• Jaan Piiskar (1883–1942), Estonian educator and politician
• Jaan Põdra (1894–1942), Estonian politician
• Jaan Port (1891–1951), Estonian botanist
• Jaan Poska (1866–1920), Estonian barrister and politician
• Jaan Puhvel (born 1932), Estonian-American Indo-Europeanist
• Jaan Puidet (born 1992), Estonian basketball player
• Jaan Rääts (1932–2020), Estonian film score composer
• Jaan Rannap (1931–2023), Estonian children's writer
• Jaan Raudsepp (1873–1945), Estonian politician
• Jaan Rekkor (born 1958), Estonian actor
• Jaan Ruus (1938–2017), Estonian film critic, journalist and film editor
• Jaan Sarv (1877–1954), Estonian mathematician and pedagogue
• Jaan Soots (1880–1942), Estonian military commander
• Jaan Tallinn (born 1972), Estonian programmer
• Jaan Talts (born 1944), Estonian weightlifter
• Jaan Tätte (born 1964), Estonian playwright, poet, actor, and singer
• Jaan Teemant (1872–?), Estonian lawyer and politician
• Jaan Tiidemann (born 1971), Estonian architect
• Jaan Tõnisson (1868–?), Estonian statesman
• Jaan Toomik (born 1961), Estonian video artist and a painter
• Jaan Tooming (born 1946), Estonian actor, stage and film director and writer
• Jaan Treumann (1881–1941), Estonian Lutheran clergyman, educator and politician
• Jaan Usin (1887–1941), Estonian Navy commander
• Jaan Vain (1886–1942), Estonian lawyer and politician
• Jaan Valsiner (born 1951), Estonian-American psychologist

Fictional characters

• Jaan Tatikas, protagonist in the Eduard Bornhöhe's novel Tallinna narrid ja narrikesed, who has become a well-known stereotype in Estonian culture