| Name: | SIAM |
| Type: | Sailing Vessel |
| Launched: | 1840 |
| Completed: | 05/1840 |
| Builder: | William Reay |
| Yard: | Walker |
| Yard Number: | |
| Dimensions: | 456nrt, 108.5 x 25.0 x 18.0ft |
| Engines: | None |
| Engines by: | n/a |
| Propulsion: | Sail, rigged as a Barque |
| Construction: | Wood |
| Reg Number: | |
| History: | |
| 16/05/1840 | Charles Bartram, Newcastle |
| 24/10/1840 | Charles Bartram, Newcastle & William Lyall, London |
| 03/11/1840 | Charles Bartram, Newcastle and William Lyall & William Turner, London |
| 31/10/1846 | Charles Bartram, Newcastle & William Lyall, London |
| No later history known | |
| Comments: | 04/11/1847: Mortgaged to the Northumberland & Durham District Banking Co |
| 1858: The bank went into liquidation & there was no trace of their asset SIAM | |
| 09/09/1869: UK Registration cancelled as "No trace" |