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The millimeter-wave absorption spectrum of acrolein has been investigated in the 59.6-120 GHz region with a Free-Jet Absorption MilliMeter Wave spectrometer. New measured rotational transitions belonging to the s-ris conformer and its three [sup.13]C isotopologues and those of [sup.13]C and [sup.18]O isotopologues of the s-trans conformer, observed in natural abundance, are reported. Key words: acrolein, millimeter wave spectroscopy, free jet spectroscopy, interstellar medium. Nous etudions le spectre d'absorption de l'acroleine dans le domaine 59.6-120 GHz a l'aide d'un spectrometre . Nous presentons de nouvelles mesures des transitions rotationnelles appartenant au conformere s-cis et ses trois isotopologues [sup.13]C et celles des isotopologues [sup.13]C et [sup.18]O du conformere s-trans, selon les abondances naturelles. [Traduit par la Redaction] Mots-cles : acroleine, spectroscopie millimetrique, spectroscopie a jet libre, milieu interstellaire, astrophysique en laboratoire, identification de structure., Introduction Acrolein (prop-2-enal, C[H.sub.2]=CH-CHO, now abbreviated as ACR), the simplest unsaturated aldehyde, has been identified as a major environmental pollutant [1, 2]. Besides industrial processes, ACR is generated by combustion [...]