Pennacchi is a surname. Notable people with the surname include:

• Antonio Pennacchi (born 1950), Italian writer
• Fulvio Pennacchi (1905–1992), Italian-Brazilian artist
• George Pennacchi, American economist
• Lucas Pennacchi (born 1960), Brazilian artist
• Pier Maria Pennacchi (1464—before 1515), Italian Renaissance painter

See also:

• Pennacchio (surname)

• William Henry Howe
• William Henry Hubbard
• William Henry Hugh Cholmondeley, 3rd Marquess of Cholmondeley
• William Henry Hughes
• William Henry Hunt (diplomat)
• William Henry Hunt (disambiguation)
• William Henry Hurlbert
• William Henry Hutchins
• William-Henry Ireland
• William Henry Irvine Shakespear
• William Henry James Boot
• William Henry John Slee
• William Henry Johnson (valet)
• William Henry "Judge" Moore
• William Henry Kelson
• William Henry Kibby
• William Henry Knight
• William Henry Krell
• William Henry Lacy
• William Henry Lambert
• William Henry Lambton
• William Henry Lamport
• William Henry Lang
• William Henry Leatham
• William Henry Leeds