約翰遜縣 (德克薩斯州)

{{Infobox U.S. county
| state = Texas
| county = Johnson County
| county_zh = 約翰遜縣
| seal =
| seal size =
| ex image =
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| founded = 1854
| named for =
| seat = Cleburne
| largest city =
| largest city wl =
| area_total_km2 = 1,902 km² (734 mi²)
| area_total_sq_mi =
| area_land_km2 = 1,889 km² (729 mi²)
| area_land_sq_mi =
| area_water_km2 = 13 km² (5 mi²)
| area_water_sq_mi =
| area percentage = 0.68%
| census yr = 2000
| census estimate yr =
| pop = 126,811
| population_density_km2 = 67
| population_density_sq_mi =
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| web = www.johnsoncountytx.org
| coordinates = {{coord|{}|0|N|{}|0|W|type:adm2nd|display=title,inline}}
}}
約翰遜縣（）是美國德克薩斯州中部偏北的一個縣。面積1,902平方公里。根據美國2000年人口普查，共有人口126,811人。縣治克利本（Cleburne）。

成立於1854年。縣名以巡警、軍人、州議員Middleton Johnson命名。本縣除里奧維斯塔外為一禁酒的縣。