Alexa Halko (born June 28, 2000) is a parasport athlete from the United States competing mainly in T34 classification sprint and middle-distance events.

[1] Halko started out in parasports at the age of seven after being approached at a farmer's market by a member of the Greater Oklahoma Disabled Sports Association.

In both she was beaten by Great Britain's Hannah Cockroft, the long-time dominant competitor in the women's T34 sprint events but with a time of 18.55 seconds in the 100 metres, Halko set a new North America record.

The following year she qualified for the 2016 Summer Paralympics in Rio, where at the age of 16 she was the youngest member of the American track and field team.

[3] She took her second medal a few days later with a silver in the 400 metres (T34), splitting the British pairing of Cockroft (gold) and Kare Adenegan (bronze).