In search of novel biologically active azoles, some new (E)-2-(3,5-dimethyl-4-(aryldiazenyl)-1H-pyrazol-1-yl)-4-arylthiazoles 3a-p have been synthesized via Hantzsch thiazole approach under greener, mild and solvent-free conditions. Structures of all compounds were established on the basis of the rigorous elemental analysis and their IR, NMR ( 1 H, 13 C), COSY, ROSEY, HSQC and HMBC spectral data. To explore the biological potential, all the synthesized compounds were evaluated for their antimicrobial, antioxidant and UV-mediated DNA damageprotective and photocleavage activity. The results of antimicrobial study revealed that among the series, compounds 3g-l were found active selectively against C. albicans. The compound 3l exhibited twofold high antifungal potential in comparison with amphotericin-B, a standard drug against C. albicans. The compound 3k was found equipotent, and 3g-j displayed half of the potential in reference to the standard drug. In UV-induced DNA damage-protecting and photocleavage study, 3j and 3n were found as the most potent DNA damage-protecting and DNA-photocleaving agents, respectively, at 40 lg concentration. The compounds 3d, 3e, 3g, 3i, 3k, 3m and 3o also displayed a significant level of DNA damage-protective potential, whereas 3l and 3p exhibited appreciable DNA photocleavage activity. In the antioxidant study, all compounds were found inactive.