doi:10.21468/SciPostPhysLectNotes.45engGarcía Irastorza, I.An introduction to axions and their detectionART-2022-128623In these notes I try to introduce the reader to the topic of axions: their theoretical motivation and expected phenomenology, their role in astrophysics and as a dark matter candidate, and the experimental techniques to detect them. Special emphasis is made in this last point, for which a relatively updated review of worldwide efforts and future prospects is made. The material is intended as an introduction to the topic, and it was prepared as lecture notes for Les Houches summer school 2021. Abundant references are included to direct the reader to deeper insight on the different aspects of axion physics. Copyright I. G. Irastorza. This work is licensed under the Creative Commons Attribution 4.0 International License.2022http://zaguan.unizar.es/record/11276410.21468/SciPostPhysLectNotes.45http://zaguan.unizar.es/record/112764oai:zaguan.unizar.es:112764info:eu-repo/grantAgreement/EC/H2020/788781/EU/Towards the detection of the axion with the International Axion Observatory/IAXOplusThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 788781-IAXOplusinfo:eu-repo/grantAgreement/ES/MINECO/PID2019-108122GB-C31SciPost Physics Lecture Notes 45 (2022), - [54 pp]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess