This qualitative study was undertaken to explore what undergraduate students reflect on during their learning to practice social work in the field. Reflection is essential in the social work field practicum where students learn the practice of social work by doing. Seventeen BSW students' final field practicum learning papers are analyzed. Four themes emerge that highlight the content of their reflections: situations of uncertainty, opportunities for application, tensions in action, and confrontations with others. This article presents in detail these 4 themes. Discussion includes suggestions for helping students better engage in reflective learning.