| Headercolor: | lightblue |
| Ragnar Hargreaves | |
| Birth Date: | 22 March 1907 |
| Birth Place: | Kristiania, Norway |
| Country: | Norway |
| Sport: | Sailing |
| Club: | Royal Norwegian Yacht Club |
Ragnar Hargreaves (22 March 1907 – 18 February 1965) was a Norwegian sailor.
He was born in Kristiania and represented the Royal Norwegian Yacht Club in that city. He competed at the 1948 Summer Olympics in London, where he placed fourth in the 6 metre class, together with Magnus Konow, Anders Evensen, Håkon Solem and Lars Musæus.[1]
Musæus was also his brother-in-law, whereas Hargreaves also was a son-in-law of Magnus Konow and brother-in-law of Karsten Konow.[1]