Isaac Nelson (1809 – 8 March 1888 ) was a Presbyterian minister and an Irish Nationalist politician.Nelson was born in Belfast and educated at Belfast Academical Institution. In August 1837 he was ordained minister of First Comber Presbyterian Church. In 1842 he was installed in Donegall Street Presbyterian Church, Belfast.He stood for Parliament while still minister at Donegall Street. Having been elected, he resigned his pastoral charge and served as the Irish Parliamentary Party Member of Parliament for Mayo in the House of Commons of the United Kingdom of Great Britain and Ireland from 1880 to 1885. Wikipedia