William Pamplin (1806–1899) was an English bookseller, publisher and botanist.
He was the son of William Pamplin (1768–1844), a nurseryman in Chelsea, where he was born on 5 August 1806.
Pamplin wrote for the Magazine of Natural History, and became editor of The Phytologist. It was owned by John Hunneman, who died in 1839. Pamplin married his daughter Caroline, and took over the publication. Hunneman had been responsible for the introduction to the United Kingdom of numerous plants from the continent.
Pamplin was also involved with the explorer Ludwig Leichhardt.
The standard author abbreviation Pamplin is used to indicate this person as the author when citing a botanical name.