"My Platonic Sweetheart" is a short dream narrative written by American writer Mark Twain. It was originally titled "The Lost Sweetheart" and written during Jul–Aug 1898, but only published in late 1912. The main character (believed to represent Twain) has several dreams throughout his life about the same woman. The narrative depicts five of these dreams, and in each dream the main character and the woman take on different names. The woman's appearance (hair and eye color) also changes in each dream. However, the characters' ages in the dreams remain the same, he is seventeen and she is fifteen, and the two characters never fail to recognize each other.