| Harmanec Tunnel | |
| Official Name: | Čremošniansky tunel |
| Location: | Slovakia |
| Coordinates: | 48.8394°N 18.9567°W |
| Operator: | ŽSR |
| Traffic: | train |
| Length: | 4698m (15,413feet) |
| Notrack: | Single |
The Harmanec Tunnel is a railway tunnel on the Banská Bystrica — Dolná Štubňa railway. It is 4698m (15,413feet) long and it is the longest railway tunnel in Slovakia. It was built from 1936 to 1940.