A display device includes a first substrate, on which a display region and a non-display region disposed outside the display region are defined; a first dam pattern and a second dam pattern, which are disposed on the first substrate in the non-display region. The first dam pattern includes a first stem section extending in a predetermined direction, and a first branch section and a second branch section extending to diverge from the first stem section, and the second dam pattern includes a second stem section disposed parallel to the first stem section, and a third branch section extending to diverge from the second stem section and facing the second branch section.