Gemellus may refer to:
- Tiberius Julius Caesar Nero Gemellus (19-37 AD), son of Drusus Julius Caesar and adopted son of Caligula;
- Tiberius Claudius Caesar Germanicus Gemellus (19-23 AD), twin brother of the previous, died as an infant;
- St. Gemellus of Ancyra (d. 362 AD), Christian martyr;
- Gemellus, a pen-name of Voltaire
Muscles
- Superior gemellus muscle, a muscle in the human body;
- Inferior gemellus muscle, a muscle in the human body.
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