Trehörningen is Swedish for "The Triangle", or literally "The Three-Corner", and can refer to many different geographical locations, including:

• Trehörningen (Sjödalen) - a lake in Huddinge Municipality, in the Sjödalen-Fullersta area.
• Trehörningen, Hanveden - a lake in Huddinge Municipality, in the Hanveden area.
• Trehörningen, Tyresta - a lake in Tyresjö Municipality, in Tyresta National Park

• Trekanten (disambiguation) ("The Three-Edge")

This disambiguation page lists articles associated with the title Trehörningen.
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