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We present an investigation of the nuclear quadrupole coupling in a series of substituted thiiranes along with thiirane itself: The rotational spectra and the quadrupole coupling hyperfine structures of $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}S$ thiirane, $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}S$ methylthiirane, $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}S$ 2,2-dimethylthiirane, and $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}S$ {anti}-2,3-dimethylthiirane in the range of 7 to 22 GHz are reported. Quantum chemical calculations un the MP4(QSD) level with basis sets of high local quality were performed, to determine the nuclear quadrupole coupling tensor of $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}S$. The analysis of the nuclear quadrupole coupling in the rotational spectra provided experimental information on the tensors.