Percy Allan | |
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| Born | 12 July 1861 |
| Died | 7 May 1930 (aged 68) Darlinghurst, New South Wales, Australia |
| Occupation | Civil engineer |
| Known for | Bridge design; Allan Truss bridge |
Percy Allan (12 July 1861 – 7 May 1930) was a civil engineer who designed many public works in New South Wales, including the design of 583 bridges.