| Gridreference: | NF751022 |
| Official Name: | Flodday |
| Coordinates: | 57°N -7.35°W |
| Location Map: | Scotland Outer Hebrides |
| Caption: | Flodday shown within the Outer Hebrides |
| Celtic Name: | Flodaigh |
| Norse Name: | floti |
| Meaning Of Name: | 'raft' or 'float' island |
| Area: | 400NaN0 |
| Area Rank: | 220= |
| Highest Elevation: | 410NaN0 |
| Population: | 0 |
| Local Authority: | Na h-Eileanan Siar |
Flodday or Flodaigh (Scottish Gaelic), is a currently uninhabited island that lies to the north east of Barra and is one of ten islands in the Sound of Barra, a Site of Community Importance for conservation in the Outer Hebrides, Scotland. Its name derives from the Old Norse for "flat island".
The island is gneiss with fertile soil. A reef to the north ends in a drying islet, Snagaras.
Flodaigh supported one family until cleared in 1851.