A single trademark suit is usually two trials in one file: a jury decides the legal claims and the money, and the judge decides the equitable relief, and the boundary between them is set by the Seventh Amendment's centuries-old line between law and equity rather than by anyone's trial preference. This guide shows how that line is drawn, why the remedy sought usually controls it, and how the allocation shapes strategy from the first draft of the complaint. It maps which trademark issues are jury-triable (actual and statutory damages, plus the confusion and validity facts beneath them) and which belong to the bench (injunctions, the accounting of profits on the prevailing view, cancellation under Section 37, fraud on the USPTO, and the equitable defenses), and it works through the Supreme Court trilogy—Beacon Theatres, Dairy Queen, and Curtis v. Loether—that forces shared facts to the jury first and binds the judge to those findings. It confronts the genuinely unsettled jury question for disgorgement after Hard Candy v. Anastasia, surveys the equitable-relief menu and its proof burdens (the eBay factors and the Trademark Modernization Act's rebuttable presumption of irreparable harm), and details the machinery of a mixed trial: Rule 42(b) bifurcation, Rule 49 special verdicts, Rule 39(c) advisory and consent juries, and the Rule 38 demand deadline that quietly waives the right. It closes with two fresh worked hypotheticals, a both-sides decision checklist, and an FAQ.