Daniel Michael O'Shaughnessy (born 14 September 1994) is a Finnish professional footballer who plays for Veikkausliiga club HJK and the Finland national team as a defender.

[3] A central defender, O'Shaughnessy began his career in Finland alongside his brother Patrick at Honka and was part of the youth team which made an impressive showing at the 2008 Nike Premier Cup.

[3] He was an unused substitute during Brentford's two League Cup ties in August 2014,[6] but instead spent the 2014–15 season in the Development Squad, for which he made 23 appearances and scored one goal.

[11] O'Shaughnessy began the 2015–16 season in the Development Squad and joined National League club Braintree Town on a one-month loan on 22 September 2015.

[13] Following another spell back with the Brentford Development Squad, O'Shaughnessy joined Danish Superliga club Midtjylland on loan until the end of the 2015–16 season in late January 2016.

[23] Despite missing the final three months of the 2018 season with a knee injury,[2] O'Shaughnessy made 24 appearances, scored three goals and in his absence,[6] HJK were crowned Veikkausliiga champions.

[6] During a period while he was conducting his national service,[2] O'Shaughnessy signed a new two-year contract in October 2019 and made 28 appearances during HJK's double-winning 2020 season.

[43] O'Shaughnessy suffered a collarbone injury in training in July,[44] but eventually on 18 August, he made his first competitive club appearance in over two years, as a starter for HJK in a 3–0 away win over Ekenäs IF (EIF).

[6] O'Shaughnessy made his full international debut as a late substitute for Ville Jalasto in a 3–0 friendly defeat to Sweden in Abu Dhabi on 10 January 2016.

[47] Two years after his maiden call-up to the senior team, O'Shaughnessy won his third cap as a half time substitute in a 2–1 friendly win over Jordan on 11 January 2018.