Gemellus

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

• Superior gemellus muscle, a muscle in the human body;
• Inferior gemellus muscle, a muscle in the human body.