This volume contains 55 of the 62 papers, plus three alternates, from the 26th West Coast Conference on Formal Linguistics (WCCFL 26), which was held at the University of California, Berkeley on April 27-29, 2007. The authors present new work in syntax, semantics, morphology, and phonology. The proceedings includes papers from two invited talks: ¿How Many Grammars Am I Holding Up? Discovering Phonological Differences between Word Classes¿ by Adam Albright, and ¿Processing Ellipsis: A Processing Solution to the Undergeneration Problem?¿ by Lyn Frazier.