Leonnatus (; 356 BC – 322 BC) was a Macedonian officer of Alexander the Great and one of the diadochi. He was a member of the royal house of Lyncestis, a small kingdom that had been included in Macedonia by King Philip II of Macedon. Leonnatus was the same age as Alexander and was very close to him. Later, he was one of Alexander's seven bodyguards, or somatophylakes. After Alexander died in 323 BC, the regent, Perdiccas, made Leonnatus satrap of Hellespontine Phrygia.