Robert Janssens (born 1939) is a Belgian composer and conductor.
He is a French-speaking member of the Union of Belgian Composers, one of whose essential missions is "to disseminate the orchestral production of our compositions".
He is the founder and president of the Brussels Summer Festival [fr], which regularly presents works by contemporary Belgian composers.
Janssens mainly composed works for large orchestra, including a piano and cello concerto and the ballet Yerma, premiered by the Ballet royal de Wallonie [fr], but also piano works and several string quartets.
Among his religious works, the Mass of the artistes is particularly noteworthy, as is the Requiem, which was celebrated with standing ovations at its premiere in Brussels in 2004.