The database of Cancer driver InDels (dbCID) is a highly curated database of driver indels (insertions and deletions) that are likely to engage in cancer development, progression, or therapy. dbCID currently contains 194 experimentally supported and 701 putative driver indels derived by manual curation of literature. The database is organized to provide informaton about cancer driver indels and interpretations in a consistent way, as well as allowing users to submit entries. It can be a valuable resource for cancer researchers and also a benchmark database for development and evaluation of methods for predicting the effects of cancer indels.