杜威縣 (奧克拉荷馬州)

{{Infobox U.S. county
| state = Oklahoma
| county = Dewey County
| county_zh = 杜威縣
| seal =
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| founded =
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| area_total_km2 = 2,611
| area_total_sq_mi = 1,008
| area_land_km2 = 2,590
| area_land_sq_mi = 1,000
| area_water_km2 = 21
| area_water_sq_mi = 8
| area percentage = 0.81%
| census yr = 2000
| census estimate yr =
| pop = 4,743
| population_density_km2 = 1
| population_density_sq_mi = 2
| time zone = Central
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| coordinates = {{coord|{}|0|N|{}|0|W|type:adm2nd|display=title,inline}}
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杜威縣（）是美國奧克拉荷馬州西部的一個縣。面積2,611平方公里。根據美國2000年人口普查，共有人口4,743人。縣治塔洛加 (Taloga)。

成立於1867年，並在1892年4月19日開放予白人殖民。縣名紀念美國海軍上將喬治·杜威 (George Dewey)。