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<b>Background:</b> Migraine is a highly prevalent and disabling primary headache disorder frequently accompanied by gastrointestinal symptoms and comorbid gastrointestinal diseases. Increasing evidence suggests that alterations in the gut microbiota and dysregulation of the microbiome-gut-brain axis may contribute to migraine pathophysiology through immune activation, oxidative stress, impaired intestinal barrier function, and neuroinflammatory signaling. <b>Objectives:</b> This narrative review aims to summarize current mechanistic and clinical evidence linking the gut-brain axis to migraine, with a particular focus on the potential roles of probiotics, prebiotics, and postbiotics as adjunctive strategies in migraine management. <b>Methods</b>: A narrative synthesis of experimental, translational, and clinical studies was performed, focusing on microbiome composition, gut barrier integrity, immune and oxidative pathways, and interventional trials evaluating probiotics, prebiotics, synbiotics, and microbiota-derived metabolites in adult and pediatric migraine populations. <b>Results</b>: Migraine has been associated with intestinal dysbiosis, increased gut permeability, and low-grade systemic inflammation. Probiotics, most commonly strains of <i>Lactobacillus</i> and <i>Bifidobacterium</i>, may modulate inflammatory cytokine profiles, enhance tight junction integrity, reduce oxidative stress, and influence neurotransmitter-related pathways along the gut-brain axis. Clinical trials evaluating probiotic supplementation report heterogeneous but promising signals, including reductions in migraine frequency, severity, disability scores, and analgesic use, particularly in chronic migraine and pediatric populations. Emerging evidence also supports a potential role for prebiotics (e.g., inulin-type fructans) and microbiota-derived metabolites such as short-chain fatty acids, although direct clinical data remain limited. <b>Conclusions</b>: Modulation of the microbiome-gut-brain axis represents a biologically plausible adjunct approach in migraine management. While probiotics, prebiotics, and postbiotics show potential benefits with favorable safety profiles, current evidence of their strain-, formulation-, and population-specific characteristics is lacking. Well-powered, placebo-controlled trials with standardized migraine endpoints and integrated microbiome and metabolomic analyses are needed to define responders, optimal interventions, and clinical relevance.