| Żyrardów County | |
| Native Name: | Powiat żyrardowski |
| Settlement Type: | County |
| Total Type: | Total |
| Image Map1: | POL powiat zyrardowski map.svg |
| Map Caption1: | Division into gminas |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Area Total Km2: | 532.63 |
| Population Total: | 75414 |
| Population As Of: | 2022 |
| Population Density Km2: | auto |
| Population Urban: | 46364 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 29050 |
| Coor Pinpoint: | Żyrardów |
| Coordinates: | 52.05°N 46°W |
| Seat: | Żyrardów |
| Parts Type: | Gminas |
| Parts: | Total 5 (incl. 1 urban) |
| P1: | Żyrardów |
| P2: | Gmina Mszczonów |
| P3: | Gmina Puszcza Mariańska |
| P4: | Gmina Radziejowice |
| P5: | Gmina Wiskitki |
| Leader Title: | Starosta |
| Leader Name: | Krzysztof Dziwisz |
| Blank Name: | Car plates |
| Blank Info: | WZY |
| Website: | http://www.powiat-zyrardowski.pl |
Żyrardów County (Polish: powiat żyrardowski) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-central Poland. It came into being on 1 January 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Żyrardów, which lies 43km (27miles) south-west of Warsaw. The only other town in the county is Mszczonów, lying 110NaN0 south-east of Żyrardów.
The county covers an area of 532.63km2. As of 2022 its total population is 75,414, out of which the population of Żyrardów is 38,784, that of Mszczonów is 6,159, that of Wiskitki is 1,421, and the rural population is 29,050.[1]
Żyrardów County is bordered by Grodzisk Mazowiecki County to the east, Grójec County to the south-east, Rawa County to the south, Skierniewice County to the west and Sochaczew County to the north-west.
The county is subdivided into five gminas (one urban, two urban-rural and two rural). These are listed in the following table, in descending order of population.
| Gmina | Type | Area (km2) | Population (2022) | Seat |
| Żyrardów | urban | 14.4 | 38,784 | |
| Gmina Mszczonów | urban-rural | 144.9 | 11,360 | Mszczonów |
| Gmina Wiskitki | urban-rural | 150.9 | 10,076 | Wiskitki |
| Gmina Puszcza Mariańska | rural | 142.4 | 8,772 | Puszcza Mariańska |
| Gmina Radziejowice | rural | 80.1 | 6,422 | Radziejowice |