The Multichannel Illinois Institute of Technology & Rush university Aging (MIITRA) atlas is specifically designed for studies of the older adult brain. This first version of the atlas includes a high-quality T1-weighted template of the older adult brain and tissue probability maps. The MIITRA T1w template was constructed with state-of-the-art spatial normalization of high-quality data from 222 older adults. The MIITRA T1w template a) exhibits high image sharpness, b) provides higher inter-subject spatial normalization accuracy compared to other standardized templates and c) similar normalization accuracy to well-constructed study-specific templates, and d) is highly representative of the older adult brain. Additional resources (templates and labels) are under development and will be released in future versions.