One star may refer to:
- One-star rank, a senior military rank
- Star (classification), a grading of, for example, a hotel, restaurant, movie, TV show or theatre or musical work or performance
- One Star (record label), producers of Haciendo El Amor Con La Ropa
- One Star Hotel, a Philadelphia-based rock band
- One Star Story (band), Missouri powerpop band
- Baire one star function, in mathematical real analysis