Amadi is a surname. Notable people with the surname include:
Bethel Nnaemeka Amadi (born 1964), Nigerian politician
Chinaza Amadi (born 1987), Nigerian long jumper
Derick Amadi (born 1984), Nigerian footballer
Elechi Amadi (born 1934), Nigerian author
Ferdinand Amadi (born 1971), Central African athlete
Ronnie Amadi (born 1981), Canadian and Arena football player