Constantine John Phipps, 2nd Baron Mulgrave FRS PC (30 May 1744 – 10 October 1792) was an English explorer and officer in the Royal Navy.

[4] Phipps attended Eton College, where he befriended Joseph Banks, the English naturalist, botanist, and later patron of the natural sciences.

His good service led to his promotion to lieutenant on 17 March 1762 by Sir George Rodney, and Phipps went on to serve in the siege of Havana.

Continuing an active naval career, he commissioned the 74-gun HMS Courageux in 1778, and played a leading role in the Battle of Ushant on 27 July that year.

Phipps led the attack on the 90-gun Ville de Paris, but the indecisive nature of the engagement meant that the French ship was able to escape.

[4] The Courageux remained under his command until 1781, with Phipps serving mostly in the Channel under Admirals Charles Hardy, Francis Geary, George Darby and Richard Howe.

[4] The title of Baron Mulgrave in the British peerage then became extinct, though his brother Henry Phipps succeeded him in the Irish barony.