The alarm was raised shortly after 3pm by a member of the public who reported what they thought to be a swimmer being carried out to sea from Rosslare Strand.
Weather conditions were good for searching, with a south west Force 4 wind blowing.
Following a four-hour search, the volunteer crew were requested to stand down the lifeboat at 7.30pm, with no one reported missing and no one found.
Speaking following the callout, Rosslare Harbour RNLI lifeboat press officer Jamie Ryan said: “We would like to commend the member of the public who raised the alarm today. That is the right thing to do if you think someone has got into difficulty on the water.”