James Robinson Planché (27 February 1796 – 30 May 1880) was a British dramatist, antiquary and officer of arms. Over a period of approximately 60 years he wrote, adapted, or collaborated on 176 plays in a wide range of genres including extravaganza, farce, comedy, burletta, melodrama and opera. Planché was responsible for introducing historically accurate costume into nineteenth century British theatre, and subsequently became an acknowledged expert on historical costume, publishing a number of works on the topic.

Planché's interest in historical costume led to other antiquarian research, including heraldry and genealogy. He was elected a Fellow of the Society of Antiquaries in 1829, and was influential in the foundation of the British Archaeological Association in 1843. Appointed Rouge Croix Pursuivant in 1854 and promoted to Somerset Herald in 1866, Planché undertook heraldic and ceremonial duties as a member of the College of Arms. These included proclaiming peace at the end of the Crimean War and investing foreign monarchs with the Order of the Garter.