The Goguryeo–Sui War were a series of invasions launched by the Sui dynasty of China against Goguryeo, one of the Three Kingdoms of Korea, between CE 598 and CE 614. It resulted in the defeat of the Sui and was one of the pivotal factors in the collapse of the dynasty, which led to its overthrow by the Tang dynasty in CE 618.

The Sui dynasty united China in CE 589, defeating the Chen dynasty and ending the division of the country that spanned almost 300 years. After the unification of China, Sui asserted its position as an overlord of neighbouring countries. However, in Goguryeo, one of the Three Kingdoms of Korea, king Pyeongwon and his successor, Yeongyang, insisted on maintaining an equal relationship with the Sui dynasty.

Emperor Wen of Sui was displeased with the challenge from Goguryeo, which continued small scale raiding into Sui's northern border. Wen sent diplomatic papers in 596 after Sui envoys spotted Goguryeo diplomats in the yurt of the Eastern Turkish Khanate and demanded the Goguryeo to cancel any military alliance with the Turks, stop the annual raiding of Sui border regions, and acknowledge Sui as their overlord. After receiving the message, Yeongyang launched a joint pre-emptive invasion with the Malgal against the Chinese along the border in present-day Hebei province in 597.