This study explores the role of knowledge access and peer influence as mechanisms by which networks may shape teacher self-efficacy. The basic premise is twofold: (a) that peer interaction provides opportunities to access teaching relevant knowledge and thus may reduce uncertainty and (b) that self-efficacy beliefs may be shaped by the efficacy beliefs of the peers one is directly connected to in the advice network. The results suggest that both mechanisms may shape teacher self-efficacy and that the quality of ties, rather than the quantity, may have a stronger influence on self-efficacy. These findings offer new insight into the potential ways in which social networks and collegial interaction influence teacher beliefs.