Andrew Brennan may refer to:

• Andy Brennan, a fictional deputy for the Twin Peaks sheriff's department
• Andy Brennan (born 1993), an Australian professional footballer
• Andrew Brennan (bishop), an American prelate of the Catholic Church

• Mitchell, Sir Thomas Livingstone
• Mitchell Smith Setzer
• Mitchell, South Dakota
• Mitchell S. Setzer
• Mitchell Township, MI
• Mitchell Township, Michigan
• Mitchell Township, MN
• Mitchell Township, Wilkin County, Minnesota
• Mitchell U-2 Superwing
• Mitchellville
• Mitchellville, AR
• Mitchellville, Arkansas
• Mitchellville, IA
• Mitchellville, Iowa
• Mitchellville, Maryland
• Mitchellville, MD
• Mitchellville, Tennessee
• Mitchellville, TN
• Mitchell, WI
• Mitchell William Sharp
• Mitchell, Wisconsin
• Mitchelstown
• Mitchelstown Castle
• Mitchelstown, Ireland
• Mitchelton, Queensland