Background and Objective: Snacks may be contaminated with various kinds of bacteria species and this is common with street vended foods. This study was carried out to determine the microbiological quality and potential exposure to aflatoxins from consumption of selected street-vended snacks in the Lagos metropolis. Materials and Methods: Twenty samples each of groundnut, kuli-kuli (groundnut cake), popcorn and chin-chin, making eighty samples, were collected from five areas in Lagos: Surulere, Oshodi, Iyana-Ipaja, Ojota and Festac. The samples were evaluated for bacteria load, fungi (yeast/mold) load and aflatoxins using standard methods. The data were analyzed statistically using Statistical Package for Social Sciences (SPSS) version 20. Results: Bacteria and fungi loads were lower than the regulatory limit. The level of total aflatoxin was highest (37.75 µg kgG 1 ) in kuli-kuli, followed by groundnut (21.24 µg kgG 1 ), chin-chin (3.88 µg kgG 1 ) and lowest in popcorn (0.45 µg kgG 1 ). The levels in kuli-kuli and groundnut were higher than the maximum permissible limit (15 µg kgG 1 ). Dietary exposure to aflatoxins ranged from 0.23 to 116.4 ng/kg-b.wt./day, which was higher than the permissible exposure level. The margin of exposure ranged from 1.5 to 378 in children and from 4.3 to 739.1 in adults, which were lower than the benchmark dose lower limit (BMDL) of 10,000, indicating high public health concerns. Conclusion: Higher levels of total aflatoxins than the maximum permissible limits in the studied samples call for public health concerns considering the level of exposure.