As well recognized in this conference, a critical task in daily life is the accurate perception and integration of information from multiple sensory modalities. Although some earlier studies had suggested that the interactions and integration of multisensory information consisted of mostly lower-level automatic processes, various more recent studies have indicated that attention can have a substantial modulatory influence over multisensory processing interactions. These attentional influences on multisensory interactions have been shown to include effects on the processing of audiovisual stimulation whose audio and visual components occur at the same location with synchronous or near-synchronous timing. In addition, however, it has recently been shown that attention to stimuli in one modality (vision) can spread to irrelevant but synchronous stimuli in another modality (audition), even when these stimulus components arise from different spatial locations (e.g., during ventriloquistic circumstances). In this talk, some of these recent studies showing how attention can influence multisensory processing, and how it can spread across the individual components of a multisensory stimulus, will be discussed, along with what these findings tell us about the mechanisms of both attention and multisensory processing.