| BIR | any of numerous brilliantly colored plumed birds of the New Guinea area |
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| BIR | ornamental plant of tropical South Africa and South America having stalks of orange and purplish-blue flowers resembling a bird |
| BIR | a tropical flowering shrub having bright orange or red flowers |
| BIR | any bird that migrates seasonally |
| BIR | someone who leads a wandering unsettled life |
| BIR | any of numerous carnivorous birds that hunt and kill other animals |
| BIR | United States saxophonist and leader of the bop style of jazz (1920-1955) |
| BIR | plant bearing very small and very hot oblong red fruits |
| BIR | a building where birds are kept |
| BIR | small lead shot for shotgun shells |
| BIR | common perennial climber of temperate regions of Eurasia and North America having dense elongate clusters of flowers |
| BIR | a person who identifies and studies birds in their natural habitats |