2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/176629At the School I gave three lectures on neutrino masses and mixings. Much of the material covered in my first two lectures is written down in a review on the subject that I published not long ago with F. Feruglio \cite{rev}. Here, I make a relatively short summary (with updates) of the content of my first two lectures, referring to our review for a more detailed presentation, and then I expand on the content of the third lecture which was dedicated to recent work on A4 models of tri-bimaximal neutrino mixing which were not covered in the review.Lectures given at IPM-LHP06, Tehran, Iran; PSN: IPM-LHP06-sch. 14 pages, 1 figure Typos corrected, one reference addedHigh Energy Physics - Phenomenologytext