Othman Yahya Alhaj Hassan (Arabic: عثمان يحيى الحاج حسن; born 7 January 1994), commonly known as Rangi, is a Saudi Arabian-born Chadian professional footballer who plays as a striker for Bahraini club Sitra. On 7 September 2022, Alhaj joined Bahraini side Sitra on a free transfer.