Yes, he is the one who marries them.
Romeo proposes to Friar Laurence that he and Juliet be married in secret, without the knowledge of their feuding families. Romeo seeks the Friar's help in marrying them to bring peace between the Capulets and Montagues.
Juliet does. "If thy bent of love be honourable, thy purpose marriage . . ."
When Romeo tells Friar Laurence that he's in love with Juliet, the Friar is initially surprised but then agrees to help them get married in hopes of ending the feud between their families.
He wants Friar's help to marry Juliet and himself.
At Friar Lawrence's cell, Romeo and Juliet were secretly married in Act 2 of William Shakespeare's play "Romeo and Juliet." Friar Lawrence conducts the marriage ceremony in secret to help the young couple in their forbidden love.
Friar Laurence because he can help him with Juliet, and Juliet turns to the Friar and also her Nanny
Romeo wants the Friar to marry him to Juliet.
He feels that marrying them will stop the feud between their two families.
She asks Friar Lawrence for help. He was the one to give her the potion that will put her to sleep for 42 hours.
Juliet's only solution to her problem with Friar Lawrence in "Romeo and Juliet" is to fake her own death with his help in order to escape her arranged marriage to Paris and reunite with Romeo.
The Friar agrees to help Romeo and Juliet get married because he hopes that their union might help to end the feud between their families, the Montagues and Capulets. He also believes that their love can bring about peace and reconciliation.
The letter which he wrote to Romeo and the liquid which only made Juliet appear dead help Friar Laurence's case.