Kang Kam-ch'an (Korean: 강감찬; Hanja: 姜邯贊; 22 December 948 – 9 September 1031) was a medieval Korean government official and military commander during the early days of Goryeo Dynasty (918–1392). Even though he was a career scholar and government official, he is best known for his military victories during the Third Goryeo-Khitan War. Kang came from the Geumju Kang clan.

In 993, the Liao Dynasty ordered General Xiao Sunning to invade Goryeo. The opinions among the court officials were divided, either to fight against the Khitans or to negotiate with them. Kang supported the use of negotiations, which was also supported by the king as the official decision. So Hui was sent to General Xiao as Korean representative, and the successful truce negotiation led to the withdrawal of Khitan forces and establishment of friendly relationship between Liao and Goryeo.

In 1004, the Khitans defeated the Chinese Song Dynasty and forced its emperor to pay tribute to the Khitan. With Song defeated, the only threat remaining against the Khitans was Goryeo. Also in 1009, General Kang Cho of Goryeo led a coup against the government; he deposed and murdered King Mokjong and began a military rule, and broke the peaceful relationship with the Khitans. The Khitans saw this as their reason to attack Goryeo, and in 1010, Emperor Shengzong of Liao led a massive invasion with a contingent of 400,000 soldiers, commanding the troops himself. Suffering heavy casualties in five major engagements, the Khitans finally defeated the Goryeo army and executed their commander General Kang Cho.

However, Kang Kam-ch'an urged King Hyeonjong to escape from the palace, not to surrender to the invading Liao troops. The King followed Kang's advice, and managed to escape from the burning capital. A Korean insurgency began to harass Khitan forces, which finally compelled Shengzong to withdraw his army. The Khitans gained no benefit from the war; rather spending precious resources in vain and reducing the national treasury. Thus another bloody war between the two nations was foreshadowed, and tensions would further lead to the Third Goryeo-Khitan War. In 1011, after the Khitan invasion was over, Kang was promoted to Hallim Academican Recipient of Edicts (한림학사 승지; 翰林學士 承旨; Hallim haksa sŭngji).

In 1018, General Xiao Baiya, under orders of the Liao administration, led an expedition to Goryeo with a 100,000 man contingent. This time, many officials urged the king to commence peace negotiations, since the damage from the Second Goryeo-Khitan War had been so great, leaving Goryeo difficult to recover. However, Kang advised the king to declare war against the Liao, since the enemy contingent was much smaller than in previous invasions. He volunteered to be the acting deputy War minister for the duration of the war, at the age of seventy-one. He led about 208,000 men toward the Goryeo-Liao border.

The first battle of the war was the Battle of Heunghwajin, which was a significant victory of Goryeo by blocking the stream and destroying the dam when Khitans were crossing the water. However, General Xiao did not give up the hope of capturing the capital Gaegyeong, and continued to march south. Later, Xiao realized that the mission was impossible to accomplish, and decided to retreat. General Kang knew that the Khitan army would withdraw from the war, and awaited them at the fortress of Gwiju, where he encountered the retreating Khitans in 1019.

Discouraged and starving, the Khitans were defeated by the Goryeo army. Only General Xiao and few remaining survivors managed to escape from the devastating defeat. This battle is known as the Battle of Gwiju. General Kang returned to the capital and was welcomed as the military hero who saved the kingdom. After the war, in 1020, Kang retired from both the military and the government to rest, since he was too old, already having become a national hero. He was appointed as Supreme Chancellor in 1030, one year before his death. He died in 1031 on the 20th day of the 8th lunar month (9 September 1031). He was buried in modern-day Cheongju, South Korea.