Kennelly is a surname and may refer to:

  • Ardyth Kennelly, American novelist
  • Arthur Edwin Kennelly, American engineer
  • Barbara B. Kennelly, Connecticut Representative
  • Brendan Kennelly, Irish poet and novelist
  • Keala Kennelly, American surfer
  • Martin H. Kennelly, mayor of Chicago
  • Matthew F. Kennelly, Federal District Court Judge in Illinois
  • Pat Kennelly, Australian politician
  • Ryan Kennelly, American powerlifter
  • Sheila Kennelly, Australian actress
  • Tadhg Kennelly, Irish Gaelic football player
  • Tim Kennelly, Irish Gaelic football player

Kennelly may also refer to:

  • Kennelly–Heaviside layer, a layer of the Earth's ionosphere