Blaha or Bláha (feminine: Bláhová) is a surname. Notable people with the surname include:
Dagmar Bláhová (born 1949), Czech television actressGeorge Blaha (born 1945), the radio and TV play-by-play voice of the Detroit Pistons since the 1976–77 NBA seasonInocenc Arnošt Bláha (1879–1960), prominent Czech sociologist and philosopherJana Blahová (born 1984), Czech sprint canoeistJan Blaha, Czech Roman Catholic bishopJohn E. Blaha (born 1942), engineer, retired United States Air Force Colonel and a former NASA astronautLubomír Blaha (born 1978), Czech professional football playerMartin Bláha (born 1977), Czech cyclistMartin Blaha (footballer) (born 1985), Czech football goalkeeper