| Horsename: | Xtension |
| Sire: | Xaar |
| Grandsire: | Zafonic |
| Dam: | Great Joy |
| Damsire: | Grand Lodge |
| Sex: | Stallion |
| Foaled: | 2 February 2007 |
| Country: | Ireland |
| Colour: | Brown |
| Breeder: | Paul McCartan |
| Owner: | Brighthelm Racing Mr & Mrs Steven Lo Kit Sing |
| Trainer: | Clive Cox John Moore |
| Record: | 25: 3-7-3 |
| Earnings: | HKD$29,197,900 |
| Race: | Vintage Stakes (2010) Champions Mile (2011, 2012) |
| Updated: | June 21, 2007 |
Xtension (; foaled 2 February 2007) is a Hong Kong based racehorse. He is one of the nominees of 2010-2011 Hong Kong Horse of the Year.