Jean Baptiste François Joseph de Warren or John Warren (21 September 1769 – 9 February 1830) was an army captain and later Lieutenant Colonel with Her Majesty's 33rd regiment of foot, East India Company in India, surveyor and amateur astronomer.
While working as a surveyor in the Great Trigonometrical Survey he rediscovered what became the Kolar Gold Fields and in later life he documented Indian astronomy and time-keeping in his book Kala Sankalita.