|Country||People's Republic of China|
|Time zone||UTC+8 (China Standard)|
Dacheng County (simplified Chinese: 大城县; traditional Chinese: 大城縣; pinyin: Dàchéng Xiàn; lit. 'Great City') is a county in the central part of Hebei province, China, bordering Tianjin to the northeast. It is the southernmost county-level division of the prefecture-level city of Langfang.