We investigate regularity criteria for weak solutions of the micropolar fluid equations in a bounded three-dimensional domain.We show that the solution (u,w) is strong on [0,T] if either u ∈ Ls(0,T; Lr,∞(Ω)) or ||u||Ls,∞(0,T;Lr,∞(Ω) is bounded from above by a specific constant, where (3/r) + (2/s) = 1 and r > 3. C 2016 AIP Publishing LLC.