| Baguashan Tunnel 八卦山隧道 | |
| Line: | THSR |
| Location: | Bagua Plateau（Changhua CountyChanghua、Fenyuan、Dacun、Yuanlin） |
| Coordinates: | 24.0648°N 120.6084°W |
| System: | THSR |
| Status: | complete |
| Start: | 石牌里, Changhua, Changhua County |
| End: | 東北里, Yuanlin, Changhua County |
| Startwork: | Apr 9, 2001 |
| Opened: | Jan 5,2007 |
| Owner: | Taiwan High Speed Rail Corporation |
| Operator: | Taiwan High Speed Rail |
| Traffic: | High-speed rail |
| Construction: | 507 days |
| Length: | 7357m (24,137feet) |
| Linelength: | 7357m (24,137feet) |
| Tracklength: | 7357m (24,137feet) |
| Notrack: | Double |
| El: | AC 25KV |
| Speed: | 315km/h |
| Hielevation: | 200m (700feet) |
| Lowelevation: | 26m (85feet) |
| Height: | 11.76m (38.58feet) |
Baguashan Tunnel is a railway tunnel through Baguashan in Taiwan, located between Taichung HSR station and Changhua HSR station. With a route length of 7,357 meters, it is the longest tunnel on Taiwan High Speed Rail. Mileage of Baguashan Tunnel is TK173+021to TK180+378.[1] [2]