宋宁宗赵扩（1168年11月19日－1224年9月17日），临安府钱塘县（今浙江杭州）人，宋朝第十三位皇帝，南宋第四位皇帝（1194年7月24日－1224年9月18日在位），宋光宗赵惇与慈懿皇后李凤娘的次子。
乾道四年（1168年）生于恭王府邸，赐名赵扩，淳熙五年（1178年）十月封英国公，淳熙十二年（1185年）封平阳郡王，淳熙十六年（1189年）进封嘉王。绍熙五年（1194年），被立为皇太子。不久，宋光宗退位，赵扩在韩侂胄、赵汝愚等大臣的拥戴下即位，更改国号为“庆元”。
Song Ningzong, also known as Zhao Kuangyi (August 2, 1127 - November 14, 1190), was the thirteenth emperor of the Song Dynasty and the fourth emperor of Southern Song (February 30, 1131 - November 15, 1141). He was a son of Emperor Gaozong and Empress Wuzhen.
During his reign, Emperor Ningzong faced several challenges. One major challenge was the conflict with Jurchen-led Jin dynasty in northern China. The war between Song and Jin had lasted for decades before it ended with a peace treaty signed by both sides in October of that year.