Jean-Jacques Nattiez (French: [natje]; born December 30, 1945, Amiens, France) is a musical semiologist or semiotician and professor of musicology at the Université de Montréal.
He studied semiology with Georges Mounin and Jean Molino and music semiology (doctoral) with Nicolas Ruwet.He is a noted specialist on the writings of the composer and conductor Pierre Boulez.In 1990, he was made a Member of the Order of Canada.
In 2001, he was made a Knight of the National Order of Quebec.