In Verona, Sampson and Gregory (Capulet servants) complain that they will not put up with insults from the Montague family. Abram and Balthasar (Montague servants) appear and the four start quarreling. Benvolio (Lord Montague's nephew) appears and tries to break up the quarrel, but Tybalt (Lady Capulet's nephew) appears and picks a fight with Benvolio. At length, officers try to break up the fight, even while Lord Capulet and Lord Montague begin to fight one another. The Prince of Verona (Escalus) appears and stops the fighting, proclaiming sentences of death to any that renew the fighting.

At Montague's house, he, his wife, and Benvolio discuss how melancholy Romeo (Montague's only son) has been lately. Benvolio vows to find out why. Speaking with Romeo, Benvolio finds Romeo is in love with a woman who has sworn to stay chaste (Rosaline). Benvolio suggests pursuing other women, but Romeo refuses. Separately, Paris (a kinsman of the Prince of Verona) talks to Lord Capulet about wooing his daughter Juliet for marriage. Capulet responds that she is too young (nearly 14 years old) and must wait two years to marry, and then only to the man whom she chooses.