A 20-year-old man from Dalton-in-Furness was treated for facial injuries after allegedly being hit in the face with a glass.
Barrow CID said the incident occurred at the Golden Ball Inn shortly before 1am this morning. The injured man had to undergo hospital treatment.
A 51-year-old Dalton man was arrested on suspicion of causing grievous bodily harm.
Anyone with information is asked to contact DC Matt Ray on non-emergency number 101.