Measuring the number one law firm depends on whether the evaluation prioritizes annual gross revenue or professional prestige. By total gross revenue, Kirkland & Ellis stands as the largest law firm in the world, generating billions annually. Conversely, measured by historic prestige, elite selectivity, and influence over corporate jurisprudence, firms like Cravath, Swaine & Moore and Wachtell, Lipton, Rosen & Katz frequently claim the top spot in peer evaluations.