Blaha or Bláha (feminine: Bláhová) is a surname. Notable people with the surname include:
Dagmar Bláhová (born 1949), Czech television actress
George Blaha (born 1945), the radio and TV play-by-play voice of the Detroit Pistons since the 1976–77 NBA season
Inocenc Arnošt Bláha (1879–1960), prominent Czech sociologist and philosopher
Jana Blahová (born 1984), Czech sprint canoeist
Jan Blaha, Czech Roman Catholic bishop
John E. Blaha (born 1942), engineer, retired United States Air Force Colonel and a former NASA astronaut
Lubomír Blaha (born 1978), Czech professional football player
Martin Bláha (born 1977), Czech cyclist
Martin Blaha (footballer) (born 1985), Czech football goalkeeper
