|Born||18 June 1799|
|Died||5 October 1880(aged 81)|
|Known for||Discovered Triton, Hyperion,|
Ariel and Umbriel moons
William Lassell (18 June 1799 – 5 October 1880) was a British astronomer, born in Bolton, Lancashire, England. He died in Maidenhead in 1880. He is known as discoverer of Triton, the largest moon of Neptune, and for his improvements to the reflecting telescope.