Nuno Miguel de Magalhães Fonseca (born 30 January 1982 in Guimarães) is a Portuguese retired footballer who played as an attacking midfielder.

Earlier in his senior career, Fonseca was under contract to both FC Porto and S.C. Braga, but only represented its reserve sides.

Famalicão, Fonseca moved to Romania in June 2008, signing with AFC Progresul București in the second level.

On 22 January of the following year, Fonseca joined PFC Lokomotiv Mezdra of Bulgaria on a three-year deal.

He made his debut with his new club two days later, in a 6–0 friendly routing of FC Botev Krivodol, but appeared rarely throughout the campaign as the team finished in mid-table.