Leo Madder (born 18 July 1946) is a Belgian television actor.

A familiar figure on Belgian television since the late 1960s he made his first appearance on TV in 1968 in Artikel 188.

Starring in a number of television series in the 1970s, he had a brief stint at TV directing in 1980 with Freule Julie and 1981 with Familie Een.

Madder portrayed of the main character in the Belgian Dutch language action drama series Spoed.

Leo's son, actor Donald Madder, died in a road accident in 2001.