Abstract Near‐infrared spectroscopy (NIRS) is a noninvasive optical technique used to estimate local muscle oxygenation by measuring hemoglobin‐related variables and muscle oxygen saturation. This information helps understand how skeletal muscles respond to diverse types and intensities of resistance training, giving a clearer picture of metabolic activity during exercise. This scoping review aimed to examine the role of NIRS as a monitoring tool in resistance training and to synthesize existing evidence on its potential applications. A systematic scoping review was conducted across five specific electronic databases: PubMed, Scopus, Cochrane Library, SPORTDiscus, and Medline (EBSCO). A total of 1658 records were identified, with 78 studies included. Most focused on male participants and single‐joint exercises, especially knee extension. The vastus lateralis was most assessed, with isometric and isokinetic contractions predominating. Intensity was typically reported as %MVC or %1RM. About 42% used external interventions (e.g., supplementation, hypoxia, BFR). Continuous‐wave NIRS systems were most common, and methodologies varied widely across studies. NIRS in resistance training is emerging; it offers a noninvasive way to monitor internal load, but current evidence does not support its ability to predict hypertrophy or strength outcomes. Its practical relevance remains unclear and needs further investigation.