Carlos Mayo Nieto (born 18 September 1995 in Madrid) is a Spanish long-distance runner.

[3] He won three medals in the European Athletics U23 Championships.

He won a bronze medal in the 5000 metres at the 2015 European U23 Championships and two years later, a gold medal in the 10000 metres and a bronze medal in the 5000 metres at the 2017 European U23 Championships.

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