Social interaction is a dynamic process wherein individuals exert reciprocal influence on one another. This process encompasses diverse types of behaviors which are infrequently delineated and examined distinctly. Moreover, while the quest for the social brain has mainly focused on the cerebrum, recent evidence has unveiled the potential engagement of cerebellar mechanisms in the regulation of social interactions. In this light, we microinfused muscimol (a GABAa receptor agonist) or saline into the deep cerebellar nuclei (DCN) of mice and measured their social behaviors in a modified version of three-chambered test. In this test, two distinct types of social behaviors – social sniffing (SS) and nose-to-nose (N2N) interactions – are defined and measured. Under the inhibitory effect of muscimol, mice spent less time in the N2N interaction compared to mice receiving saline microinfusion. However, no significant difference was found in the SS time between the two conditions. To delve deeper into the underlying mechanisms of the N2N interaction, we performed in vivo electrophysiological recordings from awake mice conjointly with either muscimol or saline microinfusion. Our preliminary results indicated that DCN firing rates were elevated during SS events under saline microinfusion. In contrast, firing rates increased shortly before the N2N occurred and remained high throughout the event. However, fewer DCN units showed specific responses to social events under muscimol microinfusion. Collectively, our findings suggest that the DCN not only plays a vital role in social interactions but also encodes various types of social behaviors in distinct patterns.