As an emerging interdisciplinary science, metallomics aims to integrate research fields related to metals and metalloids in biological systems from a systematic perspective. Inductively coupled plasma mass spectrometry (ICP-MS) is considered one of the most versatile tools for metallomics research. This review presents a brief overview of ICP-MS and describes recent advances in ICP-MS instrumentation. Then, ICP-MS-based methods and applications are discussed, focusing on single particle analysis, single cell analysis, and spatial metallomics. With the rapid developments in instrumentation and methodology, ICP-MS-based methodologies will evolve further and play a dominant role in metallomics research.