Mathematics: Biographies
- Giovanni Battista Benedetti
- Harish-Chandra
- Henry Briggs
- Henry John Stephen Smith
- Hermann Minkowski
- Hero of Alexandria
- Ibn al-Haytham
- Ibrahim Ibn Sinan
- Isaac Barrow
- Jakob I Bernoulli
- Jakob Steiner
- James Joseph Sylvester
- James Stirling
- Jean Gaston Darboux
- Jean le Rond d Alembert
- Jean Victor Poncelet
- Jerzy Neyman
- Joachim Jungius
- Johann Heinrich Lambert
- Johannes de Sacrobosco