The majority of Haribo sweets are, but you would need to check the labelling before making a purchase.
However, the non-gluten exceptions include Red Licorice Wheels, Sour S’ghetti, Black Licorice Wheels, Pico-Balla, Fruity Pasta, Pontefract Cakes and Allsorts.
A lot of Haribo products are also casein free except Allsorts and Strawberries and Cream.