Terttu Nevalainen (born 31 May 1952, Vuolijoki) is a Finnish linguist and the current Chair of English Philology at the University of Helsinki.
She has been a Member of the Finnish Academy of Sciences since 2001 and was inducted as a First Class Knight of the Order of the White Rose of Finland in 2015.
Nevalainen works on corpus linguistics, the History of English, and historical sociolinguistics.