A display device includes: a first substrate on which a display area and a non-display area which is outside the display area are defined; and a dam pattern disposed on at least one side of the display area and in the non-display area. The dam pattern includes a first dam pattern defining a first stem portion thereof which lengthwise extends in a first direction, and a first branch portion which extends from the first stem portion, and a second dam pattern defining a second stem portion thereof which lengthwise extends in the first direction, and a second branch portion which extends from the second stem portion and is spaced from and faces the first branch portion.