The authors investigated 2 broad issues: (a) across- and within-individual relationships between mood and job satisfaction and (b) spillover in moods experienced at work and at home. Using an experience-sampling methodology, they collected multisource data from a sample of 74 working individuals. Multilevel results revealed that job satisfaction affected positive mood after work and that the spillover of job satisfaction onto positive and negative mood was stronger for employees high in trait-positive and trait-negative affectivity, respectively. Results also revealed that the effect of mood at work on job satisfaction weakened as the time interval between the measurements increased. Finally, positive (negative) moods at work affected positive (negative) moods experienced later at home.