The Mauritius Command is the fourth naval historical novel in the Aubrey-Maturin series by Patrick O'Brian, first published in 1977. Aubrey is married and the father of twin girls, owner of a cottage with a fine observatory he built. He is more than ready to be back at sea. He and Stephen Maturin join a convoy charged with taking two well-located islands in the Indian Ocean from the French. The mission provides scope for each man to advance in his specialty.