GAIAOSE
| Company type | Private Anónimi Etaireía |
|---|---|
| Industry | Rail transport |
| Predecessor |
|
| Founded | 3 October 2001 |
| Successor | Greek Railways (rolling stock) |
| Headquarters | 301 Liossion street, 10445 Athens , |
Area served | Greece |
Key people | |
| Products | Railway property management |
| Owner | Greek Government (100%) |
| Website | www |
GAIAOSE S.A. (Greek: ΓΑΙΑΟΣΕ Α.Ε.) is a Greek state-owned property management company that owns and operates real estate of the Greek railway network, such as stations. From 2014 to 2025, it also managed and leased rolling stock to train operating companies, such as Hellenic Train (formerly TrainOSE).