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 Wyoming, as in other states, a mass tort is a type of civil action involving numerous plaintiffs against one or a few defendants where the claims are similar in nature. These cases often arise from exposure to harmful substances, defective products, or privacy violations such as data breaches. While mass torts can be filed individually, they are frequently brought as class action lawsuits, which allows for the consolidation of the plaintiffs' cases for efficiency and consistency in adjudication. Wyoming follows the Federal Rules of Civil Procedure for class actions, which require that the case must meet certain criteria such as numerosity, commonality, typicality, and adequacy of representation. If a case is certified as a class action, it proceeds on behalf of all class members. It's important to note that mass torts differ from other personal injury claims due to the scale and similarity of the claims, and they often involve complex legal and factual determinations. An attorney specializing in mass torts or class action lawsuits would be able to provide specific guidance on the process and regulations in Wyoming.