The Western Mediterranean Network (WM) is a regional seismological broad-band network deployed around the Ibero-Maghrebian area as a collaboration between two Spanish institutions, the San Fernando Royal Naval Observatory (ROA) and the Universidad Complutense de Madrid (UCM), being daily operated by ROA. The first WM station (SFUC) was installed by ROA and UCM in 1996 with the collaboration of the Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ). WM code was assigned in 2005 by FDSN. The WM seismic network was created to provide high quality broad-band data for scientific use and contribute to national and international data centres for seismic monitoring. Since 1996 other partners came to WM net: GFZ, the Universidade de Evora (UEVORA, Portugal) and the Institute Scientifique of RABAT (ISRABAT, Morocco). The network has evolved towards real-time data acquisition and distribution between partners and other institutions while keeping the high quality broad-band data in focus, playing a leading role in the Ibero-Maghrebian seismic studies, providing valuable data for almost all fundamental and applied regional seismological research joint projects at ROA, UCM, the other WM partners, and other institutes. The standard stations are equipped with broad-band sensors (generally STS-2 or STS-2.5, although two of them have installed Guralp sensors) that allow resolution of the complete seismic spectrum from small high-frequency local earthquakes to the largest global earthquakes, high resolution digitizers (Quanterra or Earthdata), and SeisComP with seedlink software for real-time communications. Also, some stations are equipped with accelerometers (Episensor) and also a permanent geodetic GPS are co-installed at the same places.