Nsiah is a surname. Notable people with the surname include:
Christian Nsiah (born 1975), Ghanaian sprinter Gabby Nsiah Nketiah, Ghanaian businessman and politician Philippe Nsiah (born 1994), French footballer Vida Nsiah (born 1976), Ghanaian sprinter and hurdler Nana Owusu-Nsiah, Ghanaian police officer and diplomat