Fialho is a Portuguese surname. Notable people with this surname include:
Alan Fialho (born 1993), Brazilian football player André Fialho (born 1994), Portuguese mixed martial artist Barbara Fialho (born 1987), Brazilian model and singer Éder Fialho (born 1973), Brazilian long-distance runner Deborah Fialho Secco (born 1979), Brazilian actress José Eduardo Fialho Gouveia, Portuguese television presenter José Manuel Bastos Fialho Gouveia (1935–2004), Portuguese television and radio host José Valentim Fialho de Almeida (1857–1911), Portuguese writer, journalist and translator Maria do Carmo Fialho (born 1960), Brazilian hurdler