JIA or Jia may refer to
- JIA
- Japan Institute of Architects
- Jacksonville International Airport, medium-to-large airport in the city of Jacksonville, Florida.
- Jetstream International Airlines, now known as PSA Airlines
- Johannesburg International Airport, large airport near the city of Johannesburg, South Africa
- Journal of the Institute of Actuaries, former name for the peer-reviewed journal published by the Institute of Actuaries
- Juvenile Idiopathic Arthritis, disease of joints in young people
- Jia
- meaning "home" or "family" in the Chinese language
- Jia (vessel), a type of ancient Chinese bronze vessel
- Jia County, Henan (郏县), of Pingdingshan, Henan, China
- Jia County, Shaanxi (佳县), of Yulin, Shaanxi, China
- Jia, Guan County (贾镇), town in Guan County, Shandong, China
- Family (Ba Jin novel)
- Jia Zhangke, Chinese film director
- Jia Ali, Pakistani film actress
- Jiah Khan, Indian film actress
- Jia Yi, Chinese poet
- Jia Deyao, Chinese military commander and politician
- Meng Jia (孟佳), a Chinese member of South Korean girl group Miss A