ECAT may refer to

• Escambia County Area Transit
• Energy Catalyzer (sometimes shortened to E-Cat)
• ECAT Pakistan

• Dick Zokol
• Dicladium graminicola
• DI class (locomotive)
• Dicle
• Diclectin
• Dicle Dam
• Dicle River
• Diclidantheraceae
• Diclidurus
• Diclidurus albus
• Diclidurus ingens
• Diclidurus isabellus
• Diclidurus scutatus
• Dicliptera
• Dicliptera mucronifolia
• Dicliptera sericea
• Dicliptura
• Diclofen
• Diclofenamide
• Diclofenic
• Dicloflex
• Diclonius
• Diclonius (dinosaur)
• Diclonius pentagonus
• Dicloster