Themis is one of the original titans in Greek mythology.

Themis can also refer to:

• 24 Themis, an asteroid in the (main) asteroid belt
• Protein THEMIS, a protein in humans, required for proper maturation of T cells
• THÉMIS, a solar telescope located at the Teide Observatory
• Themis (hypothetical moon), a spurious tenth moon of Saturn
• THEMIS (satellite), a constellation of five NASA satellites launched in 2007
• Themis (solar power plant), a former solar power plant in Targassonne, France
• Thermal Emission Imaging System, an instrument on the 2001 Mars Odyssey orbiter

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