HM Prison Thameside
| Aerial view of HM Prison Thameside. To the left, a section of HM Prison Belmarsh. | |
| Location | Thamesmead, London, England | 
|---|---|
| Security class | Adult Male/Category B | 
| Population | 1,232 (as of February 2017) | 
| Opened | March 2012 | 
| Managed by | Serco | 
| Director | Gary Summers and Sam Lee | 
HM Prison Thameside is a Category B men's private prison in the Thamesmead area of the Royal Borough of Greenwich, south-east London, England. Thameside Prison is operated by Serco and is situated next to Belmarsh and Isis prisons.