Toroidal (donut) planets are hypothetical rocky planets that are shaped like a toroid, or doughnut. While they have never been observed to truly exist in nature, theoretically they are quasi-stable structures. Fictional toroidal planets offer worldbuilders a unique platform to design an unusual setting. Their hubward and rimworld directions are an opportunity to insert elements like core and peripheral territories while their unusual planetary shape provides an explanation for the insertion of strange gravitational effects.

It is predicted that the tidal force of toroidal planets would force their own tectonic plates inwards towards the central hole. This could generate potentially immense mountain ranges and volcanic activity along the inner rim of the planet where the plates collide.

Toroidal planets may experience strange gravitational effects.

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