Altisidora (1810–1825) was a British Thoroughbred racehorse and broodmare best known for winning the classic St Leger Stakes in 1813.

In her final season she won four of her eight races including a Great Subscription Purse at York, the Fitzwilliam Stakes at Doncaster and a King's Plate at Richmond.

[5] On 27 May at York Racecourse, the filly started favourite for a sweepstakes and defeated Mr Garforth's unnamed grey colt and three others.

[6] On her third and final appearance as a two-year-old, Altisidora started 2/5 favourite for a sweepstakes at York on 25 August and finished third to Mr Garforth's colt.

At York in August she defeated Camelopard at level weights in a two-mile match race, earning 500 guineas for her owner.

On the following afternoon she finished last of the three runners behind the three-year-old St Leger winner Filho da Puta in the Doncaster Club Stakes over two miles and then immediately reappeared to beat two opponents in a four-mile sweepstakes.

The mare ran unplaced for the first time as she finished seventh of the ten runners behind Filho da Puta and Doctor Syntax.

[20] One of Bishop Burton's Public Houses was renamed The Altisidora in honour of the local mare, and has retained the name to the present day.