Hecates Tholus is a Martian volcano. Results indicate that a major eruption took place some 350 million years ago. The eruption created a caldera 6 miles (10 Km) in diameter. It has been suggested that glacial deposits later partly filled the caldera and an adjacent depression. Crater counts indicate this happened as recently as 5 to 20 million years ago. However climate models show that ice is not stable at Hecates Tholus today, pointing to climate change since the glaciers were active.

The volcano is at location 32.1°N 150.2°E, in Elysium Planitia, and has a diameter of 114 miles (183 Km). It is the northernmost of the Elysium volcanoes; the others are Elysium Mons and Albor Tholus.

In planetary nomenclature, a "tholus" is a "small domical mountain or hill".

Hecates Tholus viewed on Google Mars

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