Marthine Ostenstad is a 25-year-old professional football player from NOR. He currently plays for Eintracht Frankfurt Women, wearing the number 16 shirt. At the international level, he represents Norway Women. He plays primarily as a Defender.

Throughout the German Frauen Bundesliga 2025-2026, Marthine Ostenstad featured in 8 matches, averaging 0.1 tackles, 0.1 interceptions, and 2.9 clearances per game, while blocking 0.1 shots per game.