Multiresonant Au/Co/Au magnetoplasmonic nanorings exhibit magneto-optical (MO) activity that extends from the visible to the near infrared region. The spectral position and intensity of the MO features can be controlled by modifying the rings' structural parameters, opening new routes for the design of systems with interest in sensing, optical communications and isolators. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. ; Funding from Spanish Ministry of Economy and Competitiveness through grants “FUNCOAT” CONSOLIDER CSD2008–00023, MAPS MAT2011–29194-C02–01, and from Comunidad de Madrid through grant “MICROSERES-CM” S2009/TIC-1476 is acknowledged. Hua Yu Feng thanks the funding from CSC (Chinese Scholarship Council), grant No. 201206220112. F. Luo would like to acknowledge the supports of NSFC (Nos. 51002003 & 11090332) as well as RYC-2012-11954. D. G. acknowledges RYC-2012–09864. ; S2009/TIC-1476/MICROSERES ; Peer Reviewed