| Honorific-Prefix: | The Right Honourable |
| The Lord Greenway | |
| Office1: | Member of the House of Lords |
| Status1: | Lord Temporal |
| Term Label1: | as a hereditary peer |
| Term Start1: | 8 October 1975 |
| Term End1: | 11 November 1999 |
| Predecessor1: | The 3rd Baron Greenway |
| Successor1: | Seat abolished |
| Term Label2: | as an elected hereditary peer |
| Term Start2: | 11 November 1999 |
| 1Blankname2: | Election |
| 1Namedata2: | 1999 |
| Predecessor2: | Seat established |
| Birth Name: | Ambrose Charles Drexel Greenway |
| Birth Date: | 21 May 1941 |
| Alma Mater: | Winchester College |
| Occupation: | marine photographer, shipping consultant |
Ambrose Charles Drexel Greenway, 4th Baron Greenway (born 21 May 1941), is a British marine photographer and shipping consultant. He is one of the ninety hereditary peers elected to remain in the House of Lords after the passing of the House of Lords Act 1999, sitting as a crossbencher.
The son of the 3rd Baron Greenway, he was educated at Winchester College. In 1975, Greenway succeeded to his father's titles and in 1987, he was a younger brother of Trinity House. From 1994 to 2000, he was chairman of The Marine Society and from 1995 to 2004 Vice-President of the Sail Training Association. Between 2003 and 2017 he was also chairman of The World Ship Trust.[1]
In 2008, he was Commodore of the House of Lords Yacht Club.[2]
Since 1985, he has been married to Rosalynne Peta Fradgley.