| Official Name: | Underwood |
| Settlement Type: | Unincorporated community |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ontario |
| Subdivision Type2: | Regional municipality |
| Subdivision Name2: | York |
| Subdivision Type3: | City |
| Subdivision Name3: | Markham |
| Established Title: | Established |
| Established Date: | 1805 |
| Timezone: | EST |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 43.8347°N -79.3114°W |
| Area Code: | 905 and 289 |
| Blank Name: | NTS Map |
| Blank Info: | 030M14 |
| Blank1 Name: | GNBC Code |
| Blank1 Info: | FCYVU |
Underwood is a community in the Regional Municipality of York in Markham, Ontario, Canada that is located at the corner of Warden Ave between Birchmount Road and Steeles Avenue, north up to Hwy 7. Underwood is considered part of Downtown and Uptown Markham.[1] It is likely considered to be part of Milliken.
The former farm land disappeared in the 1980s and is now occupied by single family homes. The north edge of the area is occupied by commercial parks.
The place is named for Underwood, Nottinghamshire in England.[2]
The only reminder of Underwood is sign along GO Transit Stouffville line south of Denison Street between Kennedy Road and Birchmount Road.