Roger IV may refer to:

• Roger IV, Duke of Apulia (1152–1161)
• Roger IV of Foix (died 1265), Count of Foix

• Dillon M134D Gatling Gun
• Dillon Moyer
• Dillon Myer
• Dillon Overton
• Dillon Powers
• Dillon Regiment
• Dillon River Wildland Park
• Dillon River Wildland Provincial Park
• Dillon Saks
• Dillon's Bus Service
• Dillon School District
• Dillon School District 4
• Dillon School District Four
• Dillon Serna
• Dillon Simpson
• Dillon Simpson (4-H member)
• Dillon Simpson (ice hockey)
• Dillon (singer)
• Dillons Marketplace
• Dillon S. Meyer
• Dillon Smit
• Dillon S. Myer
• Dillon's Rolling Western
• Dillon's Rolling Western: The Last Ranger
• Dillon, Steve