Antoine Henri Becquerel (; French: [?~?i b?k??l]; 15 December 1852 – 25 August 1908) was a French engineer, physicist, Nobel laureate, and the first person to discover evidence of radioactivity.
For work in this field he, along with Marie Sklodowska-Curie (Marie Curie) and Pierre Curie, received the 1903 Nobel Prize in Physics.
The SI unit for radioactivity, the becquerel (Bq), is named after him.