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This is a list of amateur mathematicians—people whose primary vocation did not involve mathematics (or any similar discipline) yet made notable, and sometimes important, contributions to the field of mathematics.
- Ahmes (scribe)
- Ashutosh Mukherjee (lawyer)
- Robert Ammann (programmer and postal worker)
- John Arbuthnot (surgeon and author)
- Jean-Robert Argand (shopkeeper)
- Leon Bankoff (dentist)
- Rev. Thomas Bayes (Presbyterian minister)
- Andrew Beal (businessman)
- John Graunt (haberdasher)
- George Green (miller)
- Aubrey de Grey (gerontologist)
- Pāṇini (linguist)
- Blaise Pascal (heir, private scholar)
- Padmakumar (technician)
- Henry Perigal (stockbroker)
- Kenneth Perko (lawyer)
- Olinde Rodrigues (banker, social reformer)
- Lee Sallows (engineer)
- Robert Schlaifer (classics scholar)
- Robert Schneider (musician and record producer)
- William Shanks (landlord)
- Abraham Sharp (schoolmaster)
- David Smith (retired printer)
- Simon Stevin (merchants clerk)
- Alicia Boole Stott (secretary)
- Paul Tannery (tobacco factory director)
- Gaston Tarry (civil servant)
- Niccolò Fontana Tartaglia (bookkeeper)
- Nikola Tesla (engineer, inventor)
- Sébastien Truchet (monk)
- Franciscus Vieta (lawyer)
- Giordano Vitale (soldier)
- Walter Frank Raphael Weldon (evolutionary biologist)
- Johannes Werner (parish priest)
- Caspar Wessel (lawyer)
- Leo Wiener (linguist)
- Frank Wilcoxon (chemist)
- Edouard Zeckendorf (medical doctor)