Sofya Alexandrovna "Sonya" (Russian: Софья Александровна "Соня"; French: Sophie) is a character in Leo Tolstoy's 1869 novel War and Peace, and in Sergey Prokofiev's 1955 opera War and Peace and Dave Malloy's 2012 musical Natasha, Pierre & the Great Comet of 1812 based on it.
At the start of the novel, 15-year-old Sonya is in love with her cousin, Nikolai Rostov, who initially reciprocates her feelings.
Nikolai and Sonya rekindle their love when he returns from the war and they become engaged, much to the displeasure of the countess, who desires her son to marry a rich heiress.
When Sonya hears that Nikolai has fallen in love with Princess Maria Bolkonskaya, she is deeply hurt, though she believes the countess is correct in thinking that the only solution to the family's financial troubles is Nikolai's marriage to the wealthy Princess Maria.
Sonya hopes that Nikolai's pride will prevent the marriage; however, she eventually accepts it.