劉易斯縣 (紐約州)

{{Infobox U.S. county
| state = New York
| county = Lewis County
| county_zh = 劉易斯縣
| seal =
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| founded = 1805
| named for =
| seat = 勞維
| largest city =
| largest city wl =
| area_total_km2 = 3,341 km² (1,290 mi²)
| area_total_sq_mi =
| area_land_km2 = 3,303 km² (1,275 mi²)
| area_land_sq_mi =
| area_water_km2 = 37 km² (14 mi²)
| area_water_sq_mi =
| area percentage = 1.12%
| census yr = 2010
| census estimate yr =
| pop = 27,087
| population_density_km2 = 8
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| time zone =
| web = www.lewiscountyny.org
| coordinates = {{coord|{}|0|N|{}|0|W|type:adm2nd|display=title,inline}}
}}
劉易斯縣（）是美國紐約州西北部的一個縣。面積3,341平方公里。2010年人口27,087。縣治勞維。

成立於1805年。縣名以建縣時州長摩爾根·劉易斯命名。