Elly Appel-Vessies (27 July 1952 - 16 July 2022) was a former professional tennis player from the Netherlands. Since retiring, she played some seniors tennis. Appel-Vessies' best performance in the singles competition at a Grand Slam championship was at the 1975 French Open when she reached the third round. Her best performance in a doubles tournament at a major was at the 1976 French Open when she and Virginia Ruzici reached the quarterfinals. Appel-Vessies died on 16 July 2022 at the age of 69.