Employing a social capital framework, this study investigates teachers' role in influencing the peer dynamics between English learners (ELs) and their non-EL peers. Participants include 713 students (211 EL students). Observed teacher-student interaction quality and teacher self-reports of their peer network management were used to operationalize the teacher-directed, classroom-level factors. Peer nominations of friendships within the classroom were used to operationalize students' same-language-status (bonding capital) and cross-language-status (bridging capital) friendships. Multilevel models reveal teachers' reported practices and observed interaction quality account for a small proportion of the variance in students' bridging and bonding relationships at the classroom level overall, but with differential effects for EL and non-EL students. For example, in classrooms with greater reported use of bonding practices, EL students reported more bonding and fewer bridging friendships in the fall, and showed relatively less fall-to-spring growth in bridging friendships. Implications for future research and teacher training are discussed.