光之山 (Kōh-i Nūr，也可写为Koh-i-noor, Koh-e Noor或Koh-i-Nur) (英语: Mountain of Light, Telugu: కోహినూరు,印度语: कोहिनूर,波斯语: کوه نور )是一颗105卡（21.6克）的钻石，它曾经是世界上最大颗的钻石，目前镶嵌在英国的伊丽莎白王后冠之上。它与它的兄弟钻石光之海（Darya-ye Noor）同样来自印度的安德拉邦。后来英国东印度公司获得了它。1877年，在维多利亚女王登基成为印度女皇时，它成为了英国的皇室珠宝。

The Koh-i-Noor (Persian for Mountain of Light; also spelled Koh-i-Nûr and Kooh-è Noor) is a large, colourless diamond that was found near Guntur in Andhra Pradesh, India, possibly in the 13th century. It weighed 793 carats (158.6 g) uncut and was first owned by the Kakatiya dynasty. The stone changed hands several times between various feuding factions in South Asia over the next few hundred years, before ending up in the possession of Queen Victoria after the British conquest of the Punjab in 1849.