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The Fourier transform microwave spectra of fluorobenzene $\bullet$ sulphur dioxide and four isotopomers $(34S,two18O,andd-5)$ have been observed. The dimer has a stacked structure with the $SO2$ over the fluorobenzene ring straddling a symmetry plane. The dipole moments of $SO2$ and $C6H5F$ are oriented approximately antiparallel in the symmetry plane. The center of mass distance $(Rem)$ is $3.62(5)\backslash AA$. The $SO2$ plane is tilted relative to the fluorobenzene plane by $24\circ$ with the sulphur closer to the aromatic plane.