The Nepean Baronetcy, of Bothenhampton in the County of Dorset, was a title in the Baronetage of the United Kingdom.
It was created on 16 July 1802 for the politician and colonial administrator Evan Nepean.
Another member of the family to gain distinction was Herbert Evan Charles Bayley Nepean (1865–1951), son of Colonel Herbert Augustus Tierney Nepean, son of Reverend Evan Nepean, fourth son of the first Baronet.
Lieutenant Colonel Evan Yorke Nepean, the 6th Baronet, was notable for having the amateur radio callsign AC4YN.
With Hugh E. Richardson on a political mission to Tibet in 1936, he took this call based on his own initials and the AC4 prefix, which at that time was assigned to this country.