Julia Emilie Neilson (12 June 1868 – 27 May 1957) was an English actress best known for her numerous performances as Lady Blakeney in The Scarlet Pimpernel, for her roles in many tragedies and historical romances, and for her portrayal of Rosalind in a long-running production of As You Like It.

After establishing her reputation in a series of plays by W. S. Gilbert in 1888, Neilson joined the company of Herbert Beerbohm Tree, where she remained for five years, meeting her future husband, Fred Terry (brother to actresses Kate, Ellen, Marion and Florence Terry and great uncle of John Gielgud). With Terry, she played in London and on tour for nearly three decades. She was the mother of the actress Phyllis Neilson-Terry and actor Dennis Neilson-Terry.