Lajin (Arabic: لاجين), full royal name al-Malik al-Mansur Hussam al-Din Lajin al-Mansuri (الملك المنصور حسام الدين لاجين المنصورى; d. January 16, 1299, Cairo) was a Mamluk sultan of Egypt from 1296 to 1299.

He also tried assassinating the Sultan al-Adil Kitbugha but failed.

Lajin agreed and became Sultan under the title al-Mansur Hussam al-Din, while Kitbugha was given a fief in the Levant.

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