| Official Name: | Seen |
| Native Name: | District of the city of Winterthur |
| Settlement Type: | District |
| Coordinates: | 47.476°N 8.77°W |
| Subdivision Type: | Country |
| Subdivision Name: | Switzerland |
| Subdivision Type1: | Canton |
| Subdivision Name1: | Zürich |
| Subdivision Type2: | City |
| Subdivision Name2: | Winterthur |
| Established Title: | first mentioned |
| Established Date: | 774 |
| Established Title2: | Incorporated |
| Established Date2: | 1922 |
| Area Total Km2: | 11.01 |
| Population Total: | 17630 |
| Population As Of: | 31 Dec 2012 |
| Population Density Km2: | 1555 |
| Postal Code Type: | Postal code |
| Postal Code: | 8405, 8482 |
| Blank Name: | District number |
| Blank Info: | 3 |
| Blank1 Name: | Quarters |
| Blank1 Info: | Waser Büelwiesen Waldegg Ganzenbühl Sonnenberg Oberseen Gotzenwil Eidberg Iberg Sennhof |
Seen is a district in the Swiss city of Winterthur. It is district number 3.
The district comprises the quarters Waser, Büelwiesen, Waldegg, Ganzenbühl, Sonnenberg, Ricketwil, Oberseen, Gotzenwil, Eidberg, Iberg and Sennhof.
Seen was formerly a municipality of its own, but was incorporated into Winterthur in 1922.
Winterthur-Seen railway station is a stop of the S-Bahn Zürich on the line S11 and S26.
The station is also a terminus of line 2 of the Winterthur trolleybus system.