This document summarizes a study that explored the relationship between parental education level and student achievement in English as a foreign language. The study administered tests of English language achievement and collected demographic data from 1352 high school students in Iran. Statistical analysis found that students whose parents had secondary education or higher scored significantly higher on the English test than students whose parents had primary education. However, there was no significant difference between students whose parents had secondary versus higher education. The results provide evidence that higher parental education levels are positively associated with higher student achievement in English as a foreign language.