R28 may refer to :

• R28 road (South Africa)
• R28 (New York City Subway car)
• Very toxic if swallowed, a risk phrase
• Renault R28, Renault F1's car for the 2008 Formula One season

• Sandmann (OOMPH! song)
• Sandmann (song)
• Sandman Presents
• Sandman spinoffs
• Sandman Tangi
• Sandman (Vertigo Comics)
• S. and Marper v. The United Kingdom
• S and Marper v United Kingdom
• Sandmeyer diphenylurea isatin synthesis
• Sandmeyer isonitrosoacetanilide isatin synthesis
• Sandmeyer, T.
• Sand mine
• Sand molded casting
• Sand Mountain, Alabama
• Sandneset Point
• Sandnes FK
• Sandneshamn
• Sandneskalven Nunatak
• Sandnes Old Station
• Sandnes Sentrum Station
• Sandnessjoen
• Sandnessjoen IL
• Sandnessjoen Lufthavn
• Sandnessjoen Lufthavn, Stokka
• Sandnessjoen, Norway