Since 2001, almost all teacher education programmes in Sweden have included a final thesis. Research on teacher students’ theses in Sweden has been relatively limited in scope. In this paper, our aim is to map the research methods and topics of theses in Swedish teacher education between 2005 and 2023. The specific research aims are to quantify the prevalence of theses, to analyse changes over time, and to identify the prevalence in theses per university in relation to the following variables: methodological approach, research methods, and topic areas investigated. The titles, abstracts, and keywords of 32,199 theses from 29 universities were analysed, and the results indicated that overall there is no large change in either methodological approach, methods used, or topic areas investigated depending on university. The trend lines show an extreme increase in the use of qualitative, but not quantitative, approaches. The most prevalent method was interviews, which were used in approximately 47% of theses. Many of the theses that mentioned multiple methods also involved interviews. In contrast, the use of surveys has decreased (from 25% to 10%), while document analysis, phenomenography and interventions has increased, although with just a few percent points. With regard to topic areas, learning and instruction was the most prevalent, accounting for 26% of all theses. Furthermore, there has been an increase in the topic areas, including special education, multiculturalism and citizenship, and relational pedagogy.