The present study was devoted to acquiring complex information regarding in-service teacher training (INSETT) and evaluating the most relevant topics in the future through a bibliometric analysis. Data mining was performed using the "in-service teacher training" keyword as input to the Scopus database, as it is considered a complete and ideal data source. The VOSviewer software was employed as an analysis tool to visualise networks of authors, countries, journals and keywords. A total of 541 analysed documents have been published from 1954 to 2022. The number of in-service training publications fluctuates due to the author's productivity. The peak was in 2021, with a total of 33 articles. The most productive countries that publish INSETT documents were the United States and some European countries, while Indonesia is in the big 40. Guglielmo Trentin and Kleopatra Nikopoulou were the authors who produced the most documents and many citations. The INSETT topic has greatly been published by the Procedia Social and Behavior Science supported by Routledge publisher. The Journal of Teaching and Teacher Education has referenced topics with a great link strength with INSETT. The most frequent themes include teacher training, personnel training, "e-learning", continuing professional development, information and communication technologies and open distance learning.