| Class: | Group 3 |
| Horse Race: | September Stakes |
| Location: | Kempton Park, Sunbury, England |
| Inaugurated: | 1979 |
| Race Type: | Flat / Thoroughbred |
| Sponsor: | Unibet |
| Website: | Kempton Park |
| Distance: | 1m 3f 219y (2,413 metres) |
| Surface: | Polytrack |
| Track: | Right-handed |
| Qualification: | Three-years-old and up |
| Weight: | 8 st 11 lb (3yo); 9 st 5 lb (4yo+) Allowances 3 lb for fillies and mares Penalties 7 lb for Group 1 winners * 5 lb for Group 2 winners * 3 lb for Group 3 winners * * after 31 March |
| Purse: | £88,533 (2022) 1st: £51,039 |
|}The September Stakes is a Group 3 flat horse race in Great Britain open to horses aged three years or older. It is run at Kempton Park over a distance of 1 mile 3 furlongs and 219 yards (2,413 metres), and it is scheduled to take place each year in early September.
The event was established in 1979, and it was originally contested on turf over 1 mile, 3 furlongs and 30 yards. For a period it was classed at Listed level, and it was promoted to Group 3 status in 1982.
The race was transferred to Epsom and extended by about 200 yards in 1997. It returned to Kempton in 2000.
The September Stakes was held at Newmarket in 2005, as its regular venue was closed for redevelopment. It was switched to Kempton's newly opened Polytrack track in 2006.
Most successful horse (2 wins):
Leading jockey (4 wins):
Leading trainer (7 wins):