J
- Jacques Weber (born 1949), French actor, director and writer,
- Jake Weber (born 1964), English actor
- Javier Weber (born 1966), Argentinian volleyball player
- Joan Weber (1935 — 1981), American popular music singer
- Joe Weber (vaudevillian) (1867–1942), part of comic team of Weber and Fields
- Joseph Weber (born 1974), Firefighter/Paramedic
- Josepha Weber (1758 – 1819), German soprano
- Josip Weber (born 1964), Croatian-Belgian footballer
- John B. Weber (1842–1926), U.S. Representative from New York.
- John Henry Weber (1779–1859), Danish born, American fur trader and explorer.
- Jon Weber (born 1961), American jazz pianist and composer.
- Joseph Weber (1919–2000), American physicist; developed the laser and gravitational wave detector
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