1991 Holsten International

The 1991 Holsten International, also known as the European Indoor Championships, was an ATP men's tennis tournament held at the Deutschlandhalle in Berlin, Germany. The tournament was played on indoor carpet and was held from 8 October until 15 October 1991.

Petr Korda won his eighth career title and his fourth of the year by defeating Arnaud Boetsch in the final.

Singles
Petr Korda defeated 🇫🇷 Arnaud Boetsch, 6–3, 6–4
 * It was Korda's 2nd singles title of the year and of his career.

Doubles
Petr Korda / Karel Nováček defeated  Jan Siemerink /  Daniel Vacek, 3–6, 7–5, 7–5