The infrared multiphoton dissociation of acetone has been studied for the first time under the collisionless conditions of a molecular beam. A single carbon-carbon bond rupture channel resulting in the formation of an acetyl radical and a methyl radical is the only primary channel observed. The translational energy distribution for this channel peaks near zero with an average translational energy release of only 2.0 kcal/mol as expected for a reaction with no exit barrier. Significant secondary decomposition of the acetyl radical to carbon monoxide and methyl radical is also observed. The translation energy distribution determined for this channel is peaked well away from zero with an average energy release of 6.1 kcal/mol indicating that it proceeds on a potential energy surface with a barrier, consistent with previous UV experiments. No molecular elimination pathways are observed under the conditions of these experiments.