Given that Romeo and Juliet is a romantic tragedy, I'd say that stories such as Wuthering Heights and Cymbeline. Cymbeline in particular shares many likenesses with Romeo and Juliet the most glaring being the concept of forbidden love between a man and a woman. Wuthering Heights also shares this kind of "forbidden love" idea, where a woman is suppressing her love for one individual and must make a decision between staying with her "true" love or buckling under what society and/or other people wish for, thus terminating the existing 'forbidden' relationship.
