The Taichung–Changhua metropolitan area () is the second largest metropolitan area of Taiwan. Prior to city-county merger, it was officially defined as follows:
{|class=wikitable
!colspan=2|Taichung City (core city)!!Changhua County
|-
|width=150 valign=top|
- Beitun District
- Central District
- Dadu District
- Dali District
- Daya District
- East District
- Longjing District
- Nantun District
|width=150 valign=top|
- North District
- South District
- Taiping District
- Tanzi District
- Xitun District
- West District
- Wufeng District
- Wuri District
|width=180 valign=top|
- Changhua City (core city)
- Hemei Township
- Huatan Township
|}
Since the merger of Taichung City and the former Taichung County, the term is no longer in official usage.