Born in Ksar el-Kebir, Morocco, Mohamed Katir was raised in Mula, Murcia, Spain since he was 5 years old.

[6] In May 2021, Katir won his first Diamond League event, securing victory in the 5000 metres at the Grand Prix Gateshead in United Kingdom.

[1] In June and July, he broke three long-standing Spanish national records in just a 33-day span at the Diamond League meetings.

[8][9] Four days after that, he won the 3000 metres in Gateshead, United Kingdom with a time of 7:27.64, breaking Haile Gebrselassie meet record in the process.

[12][13] On 7 February 2024 it was announced that Katir had been provisionally suspended by the AIU for whereabouts failures due to missing three doping tests in a twelve month period.