Susan Seaforth Hayes is an American dramatic actress. She is best known for her portrayal of Julie Williams on the NBC drama Days of Our Lives, and her intermittent portrayal of Joanna Manning on the CBS daytime drama The Young and the Restless. She began playing the role of Julie on Days of Our Lives in 1968, and is the only actor to appear on the show for all seven decades it has been on the air. Seaforth Hayes still regularly appears on Days as Julie.

Julie Olson Williams is a fictional character and member of the Horton family on the NBC daytime drama, Days of Our Lives, a long running serial about working class life in the fictional town of Salem.