Eimear Nicholls née Mullan (born 21 May 1982) Portstewart is an Irish former professional triathlete who competes and wins Ironman competitions.

She is now a para triathlon guide and competed at the Paris 2024 Paralympics in the PTVI category.

As an amateur, she had already won some national competitions at both sprint and Olympic distance.

In 2014 after representing Northern Ireland at the Commonwealth games in Glasgow she went on to claim the top stop of the Embrunman podium in France.

[3][4] After a long injury break Eimear returned to racing in November’s 2017 with a victory at Ironman 70.3 Xiamen in China.