Microalgae are known to make a lot of bioactive pigments like chlorophylls, carotenoids, and phycobiliproteins. These pigments have a lot of potential in the pharmaceutical, nutraceutical, cosmetic, and food industries. Nonetheless, pigment yield is significantly affected by cultural conditions, requiring rigorous optimization procedures. This chapter focuses on enhancing pigment production in selected microalgal strains through controlled modulation of physicochemical and nutritional parameters. Variables including light intensity, photoperiod, temperature, pH, salinity, and nutrient availability (nitrogen, phosphorus, and trace elements) were investigated to identify conditions most conducive to pigment biosynthesis. Stress induction techniques, including dietary restriction and exposure to diverse light wavelengths, were utilized to activate secondary metabolite pathways. Optimization experiments were conducted using both batch and semi-continuous cultivation systems, followed by spectrophotometric and chromatographic analyses of pigment profiles. Results indicated significant improvements in carotenoid and chlorophyll content under specific combinations of high light intensity and nitrogen limitation, while phycobiliproteins were maximized under moderate light and balanced nutrient supply. These results show that adjusting culture conditions is a cheap and environmentally friendly way to boost pigment production in microalgae. The study emphasizes the possibility of customized culture methods to facilitate sustainable industrial applications of microalgal pigments.