PETRUCHIO, a (mute) follower of Tybalt
FRIAR LAURENCE
& FRIAR JOHN, Franciscans
BALTHASAR, servant to Romeo
ABRAM, servant to Montague
SAMPSON
& GREGORY
& CLOWN, servants to Capulet
PETER, servant to Juliet's Nurse
PAGE to Paris
APOTHECARY
Three MUSICIANS
LADY MONTAGUE, wife to Montague
LADY CAPULET, wife to Capulet
JULIET, daughter to Capulet
NURSE to Juliet
“Lady Montague”, as Montague’s wife is known, though the “Lady” part isn’t in the original text, only appears twice in the play. She’s very protective of her son, Romeo, and is pleased to here he’s not part of the hostilities at the beginning of the play. 
 Here she is, portrayed by Robyn Berg: 

Romeo and Juliet Characters in the Play