Henrik Eyser Overgaard-Nielsen (born 2 August 1959) is a British-Danish dentist and politician who served as a Brexit Party Member of the European Parliament (MEP) for the North West of England between 2019 and the United Kingdom's withdrawal from the EU on 31 January 2020.

[7][8] In 2013, following a 2012 holiday in the country, Overgaard-Nielsen and Bierer founded a charity, Burmadent, to provide dental services in the Inle Lake area of Myanmar (Burma).

Overgaard-Nielsen considers himself to be a socialist, in 2020 booklet Reclaiming Democracy: The Left Case for Sovereignty that he co-authored with fellow Brexit Party MEP Claire Fox, he said that when he campaigned against the Maastricht Treaty in his native Denmark in 1992, "the 'No' side was dominated by socialists and supported by intellectual and artistic elites", but when he moved to the UK in 1996, he found the Euroscepticism there anchored on the right and far-right, while the intelligentsia was mostly pro-EU.

He explained his left-wing eurosceptic views by saying that "The EU is rooted in four holy ‘pillars’: unregulated movement of capital, goods, labour and services.

[16][17] Their daughter, Laura Bierer-Nielsen, is director of policy and research at Labour Leave, a pro-Brexit campaigning group largely funded by Conservative Party donors.