This paper’s aim was to investigate a second language teacher’s beliefs about teaching and learning and her practices in relation to a student with dyslexia from a sociocultural perspective. It first referred to studies on teachers’ beliefs and practices, then the concepts of mediation, scaffolding and zone of proximal development were defined and studies on mediation and scaffolding were reviewed. Τhe data from the interview with the teacher and the classroom observations were analyzed and compared. The study illustrated that the teacher’s practices were not always consistent with her beliefs of how students with dyslexia learn better. Her teaching practice did not always have a theoretical concept behind it either. The observation of her lessons demonstrated though an effective use of multisensory methods, actions, objects and scaffolding to mediate a student’s with dyslexia learning. In the end of the chapter suggestions for teachers of students with dyslexia in similar settings are given based on the data.