Abstract This perspective article surveys the current state and prospective trajectory of magnetometry, tracing the field from its classical origins through the revolutionary discovery of giant magnetoresistance (GMR) by Fert and Grünberg in 1988 to the rapidly evolving landscape of quantum magnetic sensors. We provide a comprehensive review of high-performance magnetometer technologies – including magnetoresistive sensors (AMR, GMR, TMR), fluxgate magnetometers, giant magnetoimpedance (GMI) devices, optically pumped atomic magnetometers, SQUIDs, and materials characterization instruments (VSM, AGFM) – examining their operating principles, instrumentation requirements, and characteristic figures of merit. Emerging sensing modalities are discussed in detail, with particular emphasis on nitrogen-vacancy (NV) centers in diamond, acoustically driven ferromagnetic resonance (ADFMR) devices, alternative quantum defect platforms in silicon carbide and hexagonal boron nitride, magnetic resonance force microscopy (MRFM), and spin-torque oscillator sensors. We assess the fundamental and practical measurement challenges that constrain performance across these platforms, including quantum and thermal noise limits, low-frequency 1/f noise, calibration traceability to the SI, and spatial and temporal resolution trade-offs. Future directions are outlined across four frontiers: advanced real-time control and quantum-enhanced measurement strategies, materials and nanofabrication advances, measurement science standardization challenges, and emerging application domains spanning quantum computing, dark matter detection, brain–computer interfaces, and environmental monitoring. The article is intended to orient researchers and practitioners to the interdisciplinary opportunities at the intersection of condensed matter physics, quantum science, metrology, and biomedical engineering that will define the next generation of magnetic field sensing.