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

Muscles

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