盖马高原（朝鲜语：개마고원）位于朝鲜半岛北部的高原地带，是古朝鲜传说里盖国的所在地，韩国电视剧《朱蒙》里的玄菟郡太守良正就是在这里成长（在后汉书中高句丽的盖马大山在这里）。

盖马高原包括今日朝鲜民主主义人民共和国的两江道及咸镜南道地带，范围有40,000平方千米宽、地势约1000到2000米高，是朝鲜半岛最大的高原，有「朝鲜屋脊」的外号。那里的部落族源不详，纵所纷纭。有观点认为与东扶余有关，有人说是通古斯化的濊人，也有观点认为与马韩有关。

The Kaema Plateau is a highland in North Korea. It is surrounded by Rangrim Mountains, Macheollyeong Mountains and Bujeollyeong Mountains. It varies between 700 and 2,000 meters of altitude and at 40,000 square kilometers, sloping downward towards the northern border with People's Republic of China. It is largest tableland in Korea; it is often called "The roof of Korea". In North Korea, Kaema Plateau is divided into Kaema Plateau, Jagang Plateau, and Baekmu Plateau (in Musan). In this case, the area of Kaema Plateau reaches about 10,000 square kilometers. This Plateau was a flat plain before million years ago, an extension of Manchurian plains. Therefore, rivers like Hochon and Changjin were tributaries of Songhua River. However, the plain have uplifted to elevation of nowadays. Also, basalt from Baekdu Mountain accumulated in Changbai Korean Autonomous County, inducing the rivers into Amnok River. The valleys were formed afterward by the tributaries. Thus, flat terrain still remains in some part in southeastern part of the plateau.