Rockfleet Castle, or Carrickahowley Castle (Irish: Carraig an Chabhlaigh), is a tower house near Newport in County Mayo, Ireland. It was built in the mid-sixteenth century, and is most famously associated with Gráinne O'Malley, the pirate queen and chieftain of the clan O’Malley.
Rockfleet Castle has four floors and is over eighteen metres in height. It is open to the public; the key is available at the nearby farm. The castle was installed with a metal walkway in 2015, from its adjacent grassland surrounding to its door, due to the sheer inconvenience of accessing its entrance during high tides.