A mass tort is a civil lawsuit that involves hundreds or thousands of plaintiffs and one or a few defendants in which the plaintiffs have the same or similar claims against the defendant or defendants. Mass tort lawsuits are often filed as class action lawsuits (a procedural mechanism for joining the plaintiffs in one lawsuit), and are typically based on alleged wrongful acts (torts) such as exposure of the plaintiffs to harmful substances (asbestos or benzene), or defective products (pharmaceuticals or medical devices), or invasions of privacy (data breaches).

In Colorado, mass torts are civil actions that involve a large number of plaintiffs against one or a few defendants. These plaintiffs generally have similar legal issues or have been harmed in a similar manner by the defendant's actions. Mass torts in Colorado can be filed as class action lawsuits, which allows for the consolidation of individual claims into a single action to improve efficiency and consistency in the legal process. These lawsuits often arise from situations such as exposure to hazardous substances like asbestos, defective products including pharmaceuticals or medical devices, or large-scale invasions of privacy such as data breaches. Colorado follows both state statutes and federal laws governing class actions and mass torts, including the Colorado Rules of Civil Procedure and the Federal Rules of Civil Procedure, which provide the framework for how these cases are to be conducted. It's important for plaintiffs in Colorado to consult with an attorney who specializes in mass torts to navigate the complexities of these cases and to ensure that their rights are adequately represented.