Blu or BLU may refer to:
- Blu (artist), a visual artist
- Blu (comic strip character), a character from Monica's Gang
- BLU (company), a manga production company
- Blu (rapper), a rapper from Los Angeles, California
- David Blu (born 1980), American–Israeli basketball player
- Quadra Blu, a character from Max Rep comics by illustrator Lyman Dally
- Blu, a fictional Spix's Macaw in the 2011 film Rio
- Blu, a brand of electronic cigarette owned by Lorillard Tobacco Company