A138 may refer to:

• A138 road (England), a road around Chelmsford
• A-138 motorway (Spain), a road in Aragon connecting France at the Tunnel of Bieisa with Barbastro and the N-240

• Rhys Williams (rugby league)
• Rhys Williams (rugby player born 1988)
• Rhys Williams (rugby union)
• Rhys Williams, sociologist
• Rhys Williams (Torchwood)
• Rhys Wilmot
• Rhyta
• Rhytachne
• Rhytha
• Rhythm-action game
• Rhythm and Blues (album)
• Rhythm and blues chart
• Rhythm and Blues (disambiguation)
• Rhythm and Blues Revue
• Rhythm and Blues (TV series)
• Rhythm and Blues (World Saxophone Quartet album)
• Rhythm and Blues (WSQ album)
• Rhythm and gangsta
• Rhythm and Joy
• Rhythm And Joy
• Rhythm and Romance
• Rhythm and Roots
• Rhythm and Roots Reunion
• Rhythm and Sound
• Rhythm and Vines