Sharlene Mawdsley (born 10 August 1998) is an Irish athlete who specialises in the 400 meters and other sprint events.

Mawdsley competed at the 2022 World Championships in July, helping the Irish team finish eighth in the mixed 4×400 m relay.

In August, she competed in the 2023 World Championships 400 m semifinals[7][8] and finals of both the women's and mixed 4×400 m relays, running six races in total over nine days.

Mawdsley then passed the leading Belgian Helena Ponette in the home stretch, crossing the line first in an Irish record time of 3:09.92 with the second-fastest female split of the night at 49.40.

[18] On the 9th of September 2024, Mawdsley ended her season with a victory in the 400m at the Gala dei Castelli meeting in Bellinzona, Switzerland.