This study examines the effect of parental education levels (PELs) on the fluid intelligence of Filipino public school students. The data were drawn from a normative study of a nonverbal intelligence test involving more than 2,700 students sampled across the country. As expected, PELs have a significant impact on fluid intelligence as measured through a nonverbal intelligence test. The results indicate that PELs account for an increase of roughly three IQ points for every increment in PEL. Students with college-graduate parents scored significantly higher (d ratio = 0.66) compared to those with parents who never graduated from elementary. However, a comparison of mean scores between PELs that are adjacent (i.e., high school graduate vs. college graduate) shows relatively small differences (d ratio = 0.23 to 0.25). (Contains 1 figure, 5 tables and 7 notes.)