Here's a list of Embassies in Madrid
Embassy of Argentina (Argentinean Embassy)
Pedro de Valdivia n. 21
28006 Madrid
Phone: (+34) 91 562 2800 / 91 771 0519
Fax: (+34) 91 563 5185
Email: embajada@portalargentino.net
Web: www.portalargentino.net/eespa.htm
Embassy of Australia (Australian Embassy)
Plaza Descubridor Diego de Ord·s, 3
28003 Madrid
Phone: (+34) 91 441 6025
Fax: (+34) 91 442 5362
Web: www.embaustralia.es
Embassy of Belgium (Belgian Embassy)
Paseo de la Castellana, 18 (6)
28046 Madrid
Phone: (34) 91 577 6300
Fax: (34) 91 431 8166
Email: madrid@diplobel.org