Greenmantle
| Cover from a 1928 reprint | |
| Author | John Buchan | 
|---|---|
| Language | English | 
| Series | Richard Hannay | 
| Genre | Thriller | 
| Publisher | Hodder & Stoughton, London | 
| Publication date | 1916 | 
| Publication place | United Kingdom | 
| Media type | Print (hardback and paperback) | 
| ISBN | 978-1514836613 | 
| Preceded by | The Thirty-Nine Steps | 
| Followed by | Mr Standfast | 
Greenmantle is the second of five novels by John Buchan featuring the character Richard Hannay. It was first published in 1916 by Hodder & Stoughton, London. It is one of two Hannay novels set during the First World War, the other being Mr Standfast (1919); Hannay's first and best-known adventure, The Thirty-Nine Steps (1915), is set in the period immediately preceding the war.