Ninon Chapelle (née Guillon-Romarin, born 15 April 1995) is a French pole vaulter. She competed in the women's pole vault at the 2017 World Championships in Athletics. She represented France in 2017 European Team Championships, where she was 3rd with a jump of 4.45m in Lille. At the 2017 European Athletics U23 Championships she finished in 5th place with a jump of 4.35m.
She holds the French indoor record with a jump of 4.72 m, set on 25 February 2018 in Clermont-Ferrand.
She married fellow French pole vaulter Axel Chapelle, they have a boy named Oscar, born in 2022.