Kazys Varnelis (born 1967) is an American historian and theorist of architecture, specialising in network culture.

He has also written extensively on the Internet, locative media and network culture.

Together with Robert Sumrell, he founded AUDC as a conceptual architecture practice in 2001.

They have exhibited at Andrea Zittel's High Desert Test Sites and Art Center College of Design.

They have published their work in numerous magazines such as Cabinet, Perspecta, Textfield, Verb and 306090.