The present volume includes a selection of 20 papers from the 31st Annual Conference of the International Computer Archive of Modern and Medieval English (ICAME), held in Giessen (Germany) in May 2010. The conference topic was "Corpus linguistics and variation in English". All the papers included in the present Conference Proceedings capture aspects of variation in language use on the basis of corpus analyses, providing new descriptive insights, and/or new methods of utilising corpora for the description of language variation. Of particular interest are the five plenary papers that are included in the present volume, focusing on corpus-based approaches to variation in language from different disciplinary perspectives: Stefan Th. Gries (quantitative-statistical descriptions of variation and corpora), Michaela Mahlberg (stylistic variation and corpora), Miriam Meyerhoff (variational sociolinguistics and corpora), Edgar W. Schneider (regional variation and corpora) and Elizabeth C. Traugott (historical variation/grammaticalization and corpora).