| Grand National | |
| Location | Aintree Racecourse |
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| Date | 29 March 1958 |
| Winning horse | Mr. What |
| Jockey | Arthur Freeman |
| Trainer |
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| Owner | David J. Coughlan |
| Conditions | Soft |
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The 1958 Grand National was the 112th renewal of the world-famous Grand National horse race that took place at Aintree Racecourse near Liverpool, England, on 29 March 1958.
The field of 31 runners competed for record prize money of nearly £14,000. The race was won by 18/1 shot Mr. What, by a distance of 30 lengths. The eight-year-old was ridden by jockey Arthur Freeman and trained by Tom Taaffe, Sr., and became the fifth Irish winner of the Grand National since the Second World War.