Year 905 (CMV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Area code 905 (with overlay area codes 289 and 365) is a telephone dialling area in southern Ontario. It includes the Niagara Peninsula, Hamilton, Oshawa, and the suburban greater Toronto area. It was assigned on 4 October 1993, as a split from area code 416. 289 began sharing the service area on 9 June 2001, since then, all local calls require ten-digit dialling. On 13 April 2010, the Canadian Radio-television and Telecommunications Commission (CRTC) announced that area codes 905 and 289 would be overlaid by a third area code, 365, in early 2013.