Crystals of (salicylaldehydato)diphenylboron are orthorhombic, a = 11.6548(5), b = 16.2983(5), c = 8.0806(2) Å, Z = 4, space group Pna21. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to a final R of 0.051 for 1386 reflections with I ≥ 3σ(I). The BO2C3 ring has a distorted 'sofa' conformation. Bond lengths in the molecule (those not involving hydrogen atoms have been corrected for thermal motion) are: C—O, 1.263(4) and 1.334(4), B—O, 1.500(4) and 1.574(4), C—B, 1.603(5) and 1.610(5), C—C(salicylaldehyde), 1.368–1.423(5–8), C—C(phenyl), 1.352–1.413(5–11), and weighted mean C(sp2)—H, 0.96 Å.