Paul-Henri-Benjamin d'Estournelles de Constant, French diplomat and politician, Nobel Prize laureate (born 1852)

Paul Henri Benjamin Balluet d'Estournelles de Constant, Baron de Constant de Rebecque, was a French diplomat and politician, advocate of international arbitration and winner of the 1909 Nobel Peace Prize.

The Nobel Peace Prize is one of the five Nobel Prizes established by the will of Swedish industrialist, inventor, and armaments manufacturer Alfred Nobel, along with the prizes in Chemistry, Physics, Physiology or Medicine, and Literature. Since March 1901, it has been awarded annually to people who have "done the most or the best work for fraternity between nations, for the abolition or reduction of standing armies and for the holding and promotion of peace congresses." The Oxford Dictionary of Contemporary History describes it as "the most prestigious prize in the world."