Powerful may refer to:

• HMS Powerful, four ship and two training establishments of the Royal Navy
• Powerful-class cruiser, a class of two Royal Navy protected cruisers
• Haakon Sigurdsson (c. 937–995), de facto ruler of Norway from about 975 to 995, sometimes called Haakon the Powerful
• Powerful (song), a 2015 song by Major Lazer

See also

• Dynatoi (English: "powerful"), a Byzantine Empire legal term for the senior levels of civil, military and ecclesiastic officialdom
• Hyang, a representation of the supreme being in ancient Java and Bali mythology, also referred to as Sang Hyang Kersa ("the Powerful")
• Powerful owl, a species of owl native to Australia