The International Agency for Research on Cancer (IARC) is pleased to announce that the IARC Monograph on the herbicide glyphosate is now available online. After a systematic review and evaluation of the scientific evidence, the Monograph Working Group classified glyphosate as probably carcinogenic to humans (Group 2A). This classification is the result of a year-long evaluation by leading independent experts without conflicts of interest, who reviewed all pertinent, publicly available scientific literature on the carcinogenicity of glyphosate. The established procedures and criteria for the selection, evaluation, and integration of evidence used in developing a Monograph are provided in the Preamble to the IARC Monographs.