Callum Joshua Ryan O'Dowda is a professional footballer who plays for Oxford United as a left winger. His main strengths are his pace, skill and crossing.

In March 2015, O'Dowda was called up by Republic of Ireland U21 after becoming eligible for the national team through his late grandfather, Brendan O'Dowda, a famous Irish tenor who was born in Dundalk. O'Dowda told the club's website "I am very proud and very excited to have the call up. It is a privilege to be included. I was approached a few weeks ago to see if I would be interested because of my family’s Irish background. I jumped at the chance and can’t wait to be involved." O'Dowda made his Ireland U21 debut on 26 March 2015, playing 90 minutes, in a 1–0 win over Andorra U21. He scored his first goal for the U21s in a qualifying match for the 2017 U21 European Championships on 28 March 2016, the only Irish goal in a 3–1 defeat to Slovenia. On 12 May 2016, he received his first call up to the Republic of Ireland senior squad.