Seminars in Madrid's area
Seminars at the Instituto de Física Teórica de la U.A.M.
Seminars at the Departamento de Física Teórica de la U.A.M.
Seminars at the Departamento de Álgebra de la U.C.M.
Seminars at the Instituto de Matemáticas y Física Fundamental (I.MA.F.F.) C.S.I.C.
There is also an e-mail list that announces forthcoming Theoretical Physics and Mathematics seminars (mainly) in Madrid's area. To subscribe or announce a seminar, send an e-mail to teorica@cc.csic.es
Other Theoretical Physics Seminars in Spain
Seminars at the Institut de Física d'Altes Energies, Universitat Autònoma de Barcelona
Seminars at the Departament d'Estructura i Constituents de la Materia, University of Barcelona
Seminars at the Department of Theoretical Physics and Astrophysics, University of Granada
Seminars at the Fundamental Physics Group, University of Oviedo
Seminars at the Department of Theoretical Physics, University of Valencia
Seminars at the Department of Theoretical Physics, University of Zaragoza
A (more or less) complete list of Spanish Theoretical and High-Energy Physics Institutes can be found here.