JTL JTL may refer to: jtL, a South Korean boy band J. T. Lambert Intermediate School, in Monroe County, Pennsylvania, United States Jérôme Thibouville-Lamy, a 19th-century French musical instrument making company Topics referred to by the same term This disambiguation page lists articles associated with the title JTL.If an internal link led you here, you may wish to change the link to point directly to the intended article.