Thomas Southwell | |
|---|---|
| Baronet Southwell of Castle Mattress | |
| Tenure | 1662–1681 |
| Successor | Thomas Southwell, 1st Baron Southwell |
| Died | May 1681 |
| Spouse(s) | Elizabeth Starkey |
| Issue Detail | Richard Southwell |
| Father | Edmund Southwell |
| Mother | Catherine Herbert |
Sir Thomas Southwell, 1st Baronet, of Castle Mattress (died 7 December 1680) was a high sheriff of County Kerry under the Protectorate.