The 13 May incident was an episode of Sino-Malay sectarian violence that took place in Kuala Lumpur, the capital of Malaysia, on 13 May 1969. The riot occurred in the aftermath of the 1969 Malaysian general election when opposition parties such as the Democratic Action Party and Gerakan made gains at the expense of the ruling coalition, the Alliance Party.

Kuala Lumpur, officially the Federal Territory of Kuala Lumpur and colloquially referred to as KL, is a federal territory and the capital city of Malaysia. It is the largest city in the country, covering an area of 243 km2 (94 sq mi) with a census population of 2,163,000 as of 2022. Greater Kuala Lumpur, also known as the Klang Valley, is an urban agglomeration of 8.622 million people as of 2023. It is among the fastest growing metropolitan regions in Southeast Asia, both in population and economic development. Klang Valley is ASEAN's fifth largest economy after Singapore, Jakarta, Bangkok, and Manila.