| Charles Stephen Longuet | |
| Office: | Mayor of Invercargill |
| Term Start: | 1909 |
| Term End: | 1910 |
| Term Start2: | 1901 |
| Term End2: | 1902 |
| Birth Date: | 1861 |
| Birth Place: | Bluff, New Zealand |
| Death Date: | 10 October 1941 (aged 80) |
| Nationality: | New Zealand |
Charles Stephen Longuet (1861 – 10 October 1941) was the 27th Mayor of Invercargill from 1901 to 1902, and from 1909 to 1910. He had been on the Borough Council since 1897.
He was born in Bluff and educated in Invercargill. A lawyer, he was called to the bar in 1890 and had been the President of the Law Society.