Other
- Duffy, Australian Capital Territory, suburb of Canberra, Australia
- Duffy Fairgrounds, stadium in New York, United States
- USS Duffy (DE-27), US Navy destroyer
- Duffy antigen system, a type of cell marker proteins and the gene which codes for them
- Duffy & Partners, international branding and design firm in Minneapolis, Minnesota
- Duffy & Snellgrove, Australian book publishing company
- Duffy the Disney Bear, an anthropomorphic teddy bear character featured at Disney theme parks
- Duffy (film), movie starring James Coburn
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