Evans, Henry William, JP (1859-?), popular writing and lecturing, lived in Solva.
Grenville, Charles Francis (1749–1809), probably born Warwick Castle, horticulturist and mineral collector who developed the docks at Milford. He also tried to establish a College of King George III in the town with an observatory (see below), but died before its completion, which lead to its failure (ODNB)
Heath, Thomas Edward (1849-1918), amateur observer, popular lecturer, lived in Tenby.
Jones, Dyfrig, Dr. (1940-1989), head of the Space Plasma Physics Group at the British Antarctic Survey, did research into upper atmosphere of the Earth and into magnetospheres of the outer planets, born Crwbin.
Recorde, Robert (c.1510-1558), mathematician, astronomer and physician, born Tenby (ODNB).
Rupert-Jones, John Archibald, Commander (1874-1934), experienced in celestial navigation, lived in Milford Haven.