The past decade has seen a dramatic increase in the use of lasers for the treatment of dermatologic disorders. A variety of laser systems has been found to be useful in the treatment of numerous conditions found in the nail unit. There are many studies concerning the efficacy of laser therapy of onychomycosis, verruca, and nail psoriasis using carbon dioxide(CO2) laser, UV light therapy, Photodynamic therapy (PDT), Neodymium-doped yttrium aluminum garnet (Nd:YAG) laser, Pulse dye lasers (PDL), Intense pulsed light, and 308-nm excimer. And there are some reports about the efficacy of laser in other nail disorders (eg. onychodystrophy, onycholysis, chronic paronychia, melanonychia). However there is a lack of data concerning the long-term efficacy of laser therapy of nail disorder. This review will provide an overview and critical assessment of the field of laser for various nail disorders.