Greensborough  is a community in the Town of Markham in the Canadian province of Ontario.

Greensborough is one of the easternmost communities in Markham, and with the exception of Dickson Hill, is also the northernmost. The community is situated just north of Markham Village (a heritage district along Main St. Markham), west of Cornell, and east of Mount Joy. It includes the area north of 16th Avenue, west of Ninth Line, south of Major MacKenzie Drive and east of Markham Road. Parts of the community's northern area remain uninhabited (as residentia development continues).

Historically, Greensborough had been a predominantly agricultural area surrounding the heritage sites of Mount Joy and Markham Village in the south. Most of the current development within the community began along with the completion of Donald Cousens Way in 2005. The community has adopted a Smart Growth model which involves both low and medium density residential development along with low-density commercial and considerable park space scattered throughout.

Within the boundaries of Greensborough, there are several notable forest lots and parks. The community encompasses part of the northern portion of one of the most renowned watershed parks in the greater Toronto Area Rouge Park. Another notable park is Swan Lake Park in the south central portion of the Community.