Benjamin Williamson (1827–1916) was an Irish mathematician who was a Fellow of Trinity College Dublin (TCD) for over 60 years and was Professor of Natural Philosophy there from 1884 to 1890.
At TCD he was awarded BA (1849) and MA (1855), having become a Fellow in 1852.
He was Donegall Lecturer in Mathematics (1876–1884), and then Professor of Natural Philosophy (1884–1890).
He later became vice provost of TCD (1908), and died in Dublin.
[citation needed] His two calculus books were very popular and ran into many editions over the 40 years following their publication.