Seddon may refer to:

• Seddon (surname)

• Hundred of Seddon, a cadastral unit in South Australia
  • Seddon Conservation Park, a protected area in South Australia
  • Seddon, South Australia, a locality
• Seddon, Victoria, a suburb
  • Seddon railway station

• Seddon, New Zealand, a town
• Seddonville, a locality

• Seddon Atkinson, former British vehicle manufacturer