Roundup lawsuits in the United States involve claims that exposure to Roundup weed killer, whose active ingredient is glyphosate, caused serious health problems, particularly non-Hodgkin’s lymphoma. Thousands of individuals, including farmers, landscapers, groundskeepers, and home gardeners, allege that they developed cancer after years of regular Roundup use. These lawsuits argue that the product was marketed as safe despite scientific studies suggesting a link between glyphosate exposure and cancer.

Plaintiffs claim that Monsanto, the original manufacturer of Roundup (now owned by Bayer), knew or should have known about the potential cancer risks but failed to adequately warn consumers. According to the lawsuits, the company continued to promote Roundup as safe for humans while allegedly downplaying or disputing independent research that raised health concerns. As a result, users say they were not given the information needed to protect themselves or make informed decisions.

Many Roundup cases have been consolidated into federal multidistrict litigation to streamline pretrial proceedings and evaluate common evidence, including scientific studies and expert testimony. Some cases have gone to trial, resulting in large jury verdicts for plaintiffs, while others have been resolved through settlements. Bayer continues to deny that Roundup causes cancer and maintains that regulatory agencies have found glyphosate to be safe when used as directed.

The Roundup lawsuits have had a significant impact on public awareness of pesticide safety and corporate accountability. They have also influenced discussions about chemical regulation, product labeling, and the long-term health effects of widely used herbicides. As litigation continues, these cases remain one of the largest and most closely watched mass torts in the United States.