The graffiti was successfully removed by the management of the pub.
Staff at The George have since thanked the public through its Facebook page after messages of support were sent following the incident.
"Thanks for all the support and messages today," the statement read.
"We are shocked and truly disheartened to see our building vandalised, especially with the anniversary of the equality vote this weekend.
"But at times like these our community has come together in support, like it always does."
Investigations into the incident are ongoing.
Staff at The George expressed their shock and disgust at the graffiti, which seems to have been written in chalk and was easy to remove.
"It was distressing to see but thankfully we were able to clear it away with a few wipes," they said.
"We're not sure when it happened but it must have been early.
"Whoever it was must have been quick because no one spotted them."
Read other news on the city site of Dublin.