What is the theme in Lady Windermere's Fan by Oscar Wilde?

Hypocrisy is a major theme in this story. Most of the characters in Wilde's play accept hypocrisy as a necessary component of their social world. People in high society must pretend, must conform to the social norm in order to maintain their position. Hypocrisy is the glue that holds together a complex web of relationships; if the truth were to come out, these relationships would fall apart.