| A/S Tryvandsbanen | |
| Type: | Private |
| Fate: | acquisited by Holmenkolbanen |
| Foundation: | 4 January 1912 |
| Defunct: | 1 January 1920 |
| Location: | Aker, Norway |
| Industry: | Transport |
| Products: | Infrastructure |
| Key People: | Harald Boe |
A/S Tryvandsbanen was a Norwegian company that constructed a rail extension nicknamed Tryvandsbanen ("Tryvann Line") of the Holmenkoll Line from Besserud (then Holmenkollen) to Tryvandshøiden station. The company was established 4 January 1912 and opened the Tryvann Line 15 May 1916.[1] Tryvandsbanen was disestablished on 1 January 1920.[2]