Kopaniny (German: Krugsreuth) is a village in Karlovy Vary Region, Czech Republic. It is one of the nine municipal parts of Aš. In 2021 the village had a population of 123.

Kopaniny lies 5 kilometres northeast from Aš, about 673 meters above sea level, and is surrounded by forests.

Kopaniny was probably founded in the 12th century, but it is first mentioned in 1315, as a property of the Feiltsch family from Sachsgrün. In the middle of the 14th century village belonged to Neuberg property, and in the late 14th century it was bought by the Zedtwitz.

Historical population

Year Pop. ±% 1869 686 —     1880 714 +4.1% 1890 699 −2.1% 1900 848 +21.3% 1910 992 +17.0% 1921 885 −10.8% 1930 914 +3.3% 1950 258 −71.8%	Year Pop. ±% 1961 219 −15.1% 1970 177 −19.2% 1980 126 −28.8% 1991 114 −9.5% 2001 94 −17.5% 2011 122 +29.8% 2021 58 −52.5%
Source: Censuses

• Church of the Sacred Heart from 1890,
• Ruins of the Zedtwitz castle,
• German cemetery with Zedtwitz Tomb.

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  Church of the Sacred Heart.
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  Ruins of Zedtwitz castle.
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  Zedtwitz castle in 1907.