This content analysis research study investigated self-directed language learning of adult English as a second language (ESL) learners in libraries. ESL learners are a growing population in libraries, and understanding how they can use or are using libraries helps libraries better serve them. The purpose of this study was to determine if they can or are engaging in self-directed learning in libraries. The documents analyzed comprised library journal articles and library websites. The first finding suggests that self-directed second language learning is taking place in libraries but mainly through online instruction. The second finding is that many types of second language learning material are available for use in and through libraries. The third finding is that physical spaces dedicated to second language learning do exist in libraries. Together, these findings show that library services, resources, and spaces can support self-directed second language learners in their learning.