Developing relationships with colleagues has been identified as one way to enhance teacher resilience and assists in negotiating a professional identity. For early career teachers, opportunities to participate in induction and mentoring programmes and engage in professional learning can assist in developing these relationships. However, for early career teachers who can only obtain casual work and work intermittently often in many different schools, these opportunities may be limited. This chapter presents longitudinal, qualitative research that explores how early career casual teachers negotiated their teacher identity. Drawing on data from focus groups, semi-structured interviews and reflective tasks, the chapter shares insights into how relationships are pivotal in the development of a strong teacher identity.