To investigate the language-specific or language-integrated nature of bilingual lexical processing in different task contexts, we studied how bilinguals process nonwords that differ in their relative resemblance to the bilinguals' two languages in different versions of the lexical decision task. Unbalanced German-English bilinguals performed a pure-German, a pure-English, and a mixed lexical decision task on the same set of nonwords that were either very English-like or very German-like. Rejection latencies for these two nonword categories were reversed in the pure-English and pure-German conditions: Nonwords that were more similar to the current target language were rejected more slowly. In the mixed task, reaction times were generally slower, and nonwords resembling the participants' subdominant language (English) were harder to reject. The results suggest that task context substantially alters the criteria for the word/nonword decision in bilinguals.