Ludo Loos (13 January 1955 – 1 March 2019) was a Belgian professional road bicycle racer.
He was the first rider over all five climbs and won the stage finishing 5:19 ahead of the group of favorites which included his teammate Lucien Van Impe, Robert Alban, Joaquim Agostinho and eventual yellow jersey winner Joop Zoetemelk.
In the 1985 Vuelta a España, Loos collided with a dog in O Portádego (Culleredo, province of A Coruña), and broke a neck vertebra.
On 1 March 2019, Loos died following a long illness.
This biographical article related to a Belgian cyclist born in the 1950s is a stub.