Laccases are members of the blue multi-copper oxidase family that can oxidize a wide range of aromatic compounds. A new bacterial laccase (Lac15) has recently been obtained from a marine microbial metagenome from the South China Sea and characterized. In this work, recombinant Lac15 was overexpressed in Escherichia coli, purified and crystallized using the hanging-drop vapour-diffusion method. An X-ray diffraction data set was collected to 2.2 Å resolution. The crystal belonged to space group C121, with unit-cell parameters a = 123.41, b = 91.36, c = 86.157 Å, β = 112.10°.