| Franz Islacker | |
| Birth Date: | 3 February 1926 |
| Birth Place: | Essen, Germany |
| Position: | Forward |
| Years1: | 1945–1949 |
| Clubs1: | TuS Helene Altenessen |
| Years2: | 1949–1950 |
| Clubs2: | VfR Mannheim |
| Years3: | 1950–1952 |
| Clubs3: | Rheydter SV |
| Years4: | 1952–1961 |
| Clubs4: | Rot-Weiss Essen |
| Nationalyears1: | 1954 |
| Nationalteam1: | West Germany |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
Franz Islacker (3 February 1926 – 1 July 1970) was a German footballer who played who played as a forward. He is most notable for scoring a hat-trick for Rot-Weiss Essen in the final of the 1955 German football championship against Kaiserslautern. He was the father of Frank Islacker and the grandfather of Mandy Islacker.
Rot-Weiss Essen