Introduction and Combined Acid Catalysis Super Bronsted Acids Chiral Bronsted Acids Li(I), Na(I) and K(I) Lewis Acids Mg(II), CA(II) and Zn(II) Lewis Acids B(III) Lewis Acids Al(III) Lewis Acids Ga(III) Lewis Acids In(III) Lewis Acids Si(IV) Lewis Acids Sn(II) and Sn(IV) Lewis Acids Bi(III) Lewis Acids Sc(III) and Y(III) Lewis Acids Lanthanide Lewis Acids Ti(IV) Lewis Acids Zr(IV) and Hf(IV) Lewis Acids Transition Metal Lewis Acids: From Vanadium to Platinum Cu(I) and Cu(II) Lewis Acids Ag(I) and Au(I) Lewis Acids Polymer-Supported Metal Lewis Acids