林縣 (愛阿華州)

{{Infobox U.S. county
| state = Iowa
| county = Linn County
| county_zh = 林縣
| seal =
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| founded =
| named for =
| seat = 錫達拉皮茲
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| area_total_km2 = 1,877 km² (725 mi²)
| area_total_sq_mi =
| area_land_km2 = 1,858 km² (717 mi²)
| area_land_sq_mi =
| area_water_km2 = 18 km² (7 mi²)
| area_water_sq_mi =
| area percentage = 0.98%
| census yr = 2006
| census estimate yr =
| pop = 201,853 [http://factfinder.census.gov/servlet/GCTTable?_bm=y&-geo_id=04000US19&-_box_head_nbr=GCT-T1-R&-ds_name=PEP_2006_EST&-_lang=en&-format=ST-2S&-_sse=on]
| population_density_km2 = 103
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| web = www.co.linn.ia.us
| coordinates = {{coord|{}|0|N|{}|0|W|type:adm2nd|display=title,inline}}
}}
林縣（）是美國愛阿華州東部的一個縣。面積1,877平方公里。根據美國2000年人口普查，共有人口191,701。縣治錫達拉皮茲（Cedar Rapids）。

成立於1837年12月21日。縣名紀念代表密蘇里州的聯邦參議員劉易斯·菲爾茨·林（Lewis Fields Linn）。