The pub is on a tourist route in the area known as the Ring of Kerry.
Twitter user Maurice Campbell of Northern Ireland posted a picture of the sign on his account.
It must be a great thing in life to have your money made! Waterville, Co. Kerry pic.twitter.com/jZccZhsMs9
— Maurice Campbell (@mauricecampbell) June 6, 2014"I thought it was out of order. It seemed nasty," Campbell told CNBC.
He went in and attempted to speak to owner Peter Fitzgerald about the sign. "I went in and told him 'I'm a bit loud myself, but I'm not American.'" Campbell said. "He just gave me a look."
Tourism is a big part of the area's economy, so an unwelcoming attitude could be costly.
The Waterville Business Association said "the sign in no way represents the views of Waterville businesses or the community as a whole" and that "Americans are always welcome in the village," according to Radio Kerry.
Read More
- Canadian woman attempts to dine-and-dash but leaves her purse behind
- Scottish mayor steps down after getting banned from every pub in town
- Woman refuses to give breath sample after accident because she's 'too busy drinking'
- 91-year-old man returns library book 61 years late
- Japanese bar offering discount to bald customers
- Man in sombrero and poncho accused of 'surfing' on top of MBTA commuter train
