'Ubadah ibn al-Samit (Arabic: عبادة بن الصامت ʿUbādah ibn aṣ-Ṣāmit) was a companion of Muhammad and a well-respected chieftain of the Ansar tribes confederation. He participated in almost every battle during Muhammad's era. His official title, according to Muslim scholarly tradition, was 'Ubadah bin Saamit al-Ansari al-Badri (عبادة بن الصامت الانصاري البدري) for his actions at the Battle of Badr. He served under the first three Rashidun caliphs in the Muslim conquest against the Byzantines.