Irezumi (入れ墨, 入墨, 紋身, 刺花, 剳青, 黥 or 刺青) is a Japanese word that refers to the insertion of ink under the skin to leave a permanent, usually decorative mark; a form of tattooing.

The word can be written in several ways, each with slightly different connotations. The most common way of writing irezumi is with the Chinese characters 入れ墨 or 入墨, literally meaning to "insert ink". The characters 紋身 (also pronounced bunshin) suggest "decorating the body". 剳青 is more esoteric, being written with the characters for "stay" or "remain" and "blue" or "green", and probably refers to the appearance of the main shading ink under the skin. 黥 (meaning "tattooing") is rarely used, and the characters 刺青 combine the meanings "pierce", "stab", or "prick", and "blue" or "green", referring to the traditional Japanese method of tattooing by hand.