Women’s reproductive health is of paramount importance, given their central roles in family and societal well-being. During the reproductive years, women are particularly vulnerable to physiological and psychosocial challenges arising from dynamic hormonal fluctuations, emotional stress, sexual practices, and complex interpersonal relationships. This vulnerability is further exacerbated by limited awareness of reproductive health and low socioeconomic status. Lifestyle factors, including dietary habits, sleep patterns, personal hygiene, and inadvertent exposure to pathogens, also significantly influence reproductive outcomes. The human vagina harbours a highly specialised and dynamic microbial ecosystem, predominantly composed of beneficial Lactobacillus species, including Lactobacillus crispatus, Lactobacillus gasseri, Lactobacillus iners, and Lactobacillus jensenii. These species play a crucial role in maintaining vaginal health by preserving an acidic pH, sustaining epithelial integrity, and regulating mucosal immune homeostasis. Disruption of this microbial balance leads to dysbiosis, which is associated with conditions such as bacterial vaginosis (BV), vulvovaginal candidiasis, and sexually transmitted infections (STIs). BV-associated microorganisms, including Gardnerella vaginalis, Prevotella bivia, bacterial vaginosis-associated bacteria (BVABs), and Sneathia species, along with STI-causing pathogens such as Neisseria gonorrhoeae, Chlamydia trachomatis, Treponema pallidum, Mycoplasma genitalium, human papillomavirus (HPV), herpes simplex virus (HSV), and human immunodeficiency virus (HIV), contribute significantly to reproductive morbidity. Additionally, opportunistic pathogens such as Escherichia coli, Enterococcus faecalis, and Group B Streptococcus further complicate vaginal health. This review comprehensively examines the vaginal microbiota in both healthy and diseased states, with particular emphasis on the mechanistic pathways that underlie its associations with epithelial barrier disruption, immune modulation, biofilm formation, microbial ascension, and chronic inflammation. These interconnected processes are implicated in adverse reproductive outcomes, including infertility, preterm labour, recurrent pregnancy loss, and cervical carcinogenesis. Furthermore, emerging multi-omics approaches such as metagenomics, metatranscriptomics, metabolomics, and organ-on-chip technologies hold significant promise for advancing diagnostic precision and therapeutic interventions. Finally, the limitations of conventional antimicrobial therapies are critically evaluated, and novel microbiota-targeted strategies, including strain-specific probiotics, vaginal microbiota transplantation, bacteriophage therapy, and partner-inclusive interventions, are highlighted. It is anticipated that this review will raise awareness and promote strategies to restore the functional balance and resilience of the vaginal microbiome, thereby improving women’s reproductive health and overall quality of life.