Katharina Ostermann plays beach volleyball for SV Cappeln and competes in the federation “Nordwestdeutscher Volleyball-Verband”.
Currently listed in DVV Damen 2026 (rank 614, 3 points); WVV Damen 2026 (rank 2027, 0 points); NWVV Erwachsene Frauen 2026 (rank 74, 938 points). 6 tournament results are documented since 2023, most of them in 2023 (2). Most recently documented: place 4 at Kategorie A (May 9, 2026). Most frequent partners in the results: Bernice Andoh, Lina Hansen.