Single dwelling unit, a single-family, free-standing residential building (home). It is defined in opposition to a multi-family residential dwelling (e.g. apartment).
Special Detective Unit, a specialist branch of the Garda Síochána, Ireland's national police
Special Duties Unit, a paramilitary special force of the Hong Kong Police Force
This disambiguation page lists articles associated with the title SDU. If an internal link led you here, you may wish to change the link to point directly to the intended article.