King Prajadhipok (Rama VII, Thai: พระปกเกล้าเจ้าอยู่หัว Phra Pokklao Chaoyuhua) (November 8, 1893 - May 30, 1941) was the seventh king of the Chakri dynasty. He was the last absolute monarch and the first constitutional monarch of Siam.

Prajadhipok's reign was the shortest, and probably the most controversial, in the history of the Chakri Dynasty. On the one hand, the short history of this reign is the story of the movement of great historical forces—of political aspirations, public opinion, social and political mobilisation, and economic modernisation—while, on the other hand, it is very much the story of individuals and personalities and their effect upon historical events.