| Conflict: | Siege of Fredrikstad |
| Partof: | the Swedish–Norwegian War of 1814 |
| Date: | 4 August 1814 |
| Place: | Fredrikstad, Norway |
| Coordinates: | 59.2053°N 10.95°W |
| Result: | Swedish victory |
| Combatant1: |  Norway |
| Combatant2: | Sweden |
| Commander1: | Christian Frederick Nils Christian Frederik Hals |
| Commander2: | Charles XIII of Sweden Crown Prince Charles John |
| Strength1: | 1,100 |
| Strength2: | 6,000 50 gunboats |
| Casualties1: | 207 surrendered |
| Casualties2: | 7 killed 12 wounded |
Fredrikstad Fortress, under the command of Nils Christian Frederik Hals, was captured by the Swedish armed forces on 4 August 1814. 207 men remained in the fortress as the Norwegian surrendered to the Swedes; the rest had evacuated earlier. The Swedish casualties were few, 7 men killed and 12 wounded from the army, navy and Archipelago fleet combined.