Preben Blach
Preben Blach was a Danish field hockey player. He competed in the men's tournament at the 1948 Summer Olympics.
Blach came from a family of hockey players. His father Arne Blach was also a hockey player and competed in the 1928 Olympics and the 1936 Olympics. His uncles Ejvind Blach and Svend Blach competed at the 1920 Olympics.