This talk introduces the audience to MRI of brown adipose tissue (BAT). BAT studies in both animals and humans have progressed rapidly during the past decade. While positron emission and computed tomography (PET/CT) is likely to remain as a reference modality in BAT imaging, approaches using MRI have emerged as viable alternatives. MRI-based quantitative measurements of BAT fat content and metabolism are discussed. An outlook on research opportunities and future directions is provided.