| Grand National | |
| Location | Aintree Racecourse |
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| Date | 5 April 1946 |
| Winning horse | Lovely Cottage |
| Jockey | Capt. Robert Petre |
| Trainer | Tommy Rayson |
| Owner | John Morrant |
| Conditions | Good |
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The 1946 Grand National was the 100th renewal of the world-famous Grand National horse race that took place at Aintree Racecourse near Liverpool, England, on 5 April 1946. It was the first true Aintree Grand National since 1940 due to World War II. It was the last Grand National to take place on a Friday, which had been the traditional day for the race since 1876.
The National was won by 25/1 shot Lovely Cottage, ridden by jockey Captain Robert Petre and trained by Tommy Rayson.
Thirty-four horses ran and all but one returned safely to the stables. Symbole fell at Becher's Brook, incurring a fatal cervical fracture.