  We classify up to Morita equivalence all blocks whose defect groups are
Suzuki $2$-groups. The classification holds for blocks over a suitable discrete
valuation ring as well as for those over an algebraically closed field, and in
fact holds up to basic Morita equivalence. As a consequence Donovan's
conjecture holds for Suzuki $2$-groups. A corollary of the proof is that Suzuki
Sylow $2$-subgroups of finite groups with no nontrivial odd order normal
subgroup are trivial intersection.
