Although many ethnography handbooks recommend keeping fieldnotes, very few publications have concretely discussed the form and role of a field diary. What can keeping a research diary in (auto)ethnographies of translation teach translation scholars about their research? In this chapter, I present examples drawn from the diary I am currently keeping as part of an autoethnographic study of volunteer translation in an organization that promotes vegetarianism and veganism in Switzerland. The examples show that field diaries can be complementary sources of data. They can improve the quality of data collection and provide a space for ongoing ethical appraisal. Research journals also create space for self-reflexivity and theoretical production. Furthermore, they can function as therapeutic tools and fuel academic creativity.