Klang War

Klang War
Date	1866–1874
Location	Selangor
Result	Tengku Kudin faction victory Beginning of British residency of Selangor; Selangor became part of the Federated Malay States in 1895;
Belligerents
Raja Abdullah loyalist; Pahang Kingdom; Sultanate of Kedah (Tengku Kudin); Hai San; Supported by:; Sultan of Selangor; United Kingdom (from 1873); Netherlands (One European officers); Italy (One European officers); (20 European and Eurasian non commissioned officers); (200 Indian Sepoy);	Raja Mahadi loyalists; Sumatran groups; Ghee Hin; Supported by:; Local Malay chiefs;
Commanders and leaders
Raja Abdullah; Raja Ismail; Tengku Kudin; Mohamed Tahir; Yap Ah Loy	Raja Mahadi; Raja Mahmud; Syed Mashhor; Chong Chong †

The Klang War or Selangor Civil War was a series of conflicts that lasted from 1866 to 1874 in the Malay state of Selangor in the Malay Peninsula (modern-day Malaysia).

It was initially fought between Raja Abdullah, the administrator of the Klang Valley, and Raja Mahadi. It was joined by Tengku Kudin (Tengku Dhiauddin, also spelt Ziauddin), a Kedahan prince, as well as other Malay and Chinese factions. The war was eventually won by Tengku Kudin and Abdullah's son, Raja Ismail.