This study modified and validated a measure of motivational orientations--grounded in self-determination theory and originally developed for postsecondary students--for use with younger (pre-college) English language learners (ELLs). Exploratory factor analysis results in Sample A (n = 528) indicated that the data were best explained by a three-factor solution (intrinsic motivation, introjected regulation, and external regulation) that explained 51.6% of the variance. These results were corroborated by a confirmatory factor analysis in an independent Sample B (n = 529; GFI = 0.97, CFI = 0.96, SRMR = 0.04, RMSEA = 0.05). The test for invariance across the two samples further supported the validity of the measure. The modified instrument, named English Language Learner Motivation Scale (ELLMS): Pre-College, showed strong psychometric characteristics for use with elementary (ages 9-11 years), middle (ages 12-14 years), and high school (ages 16-17) ELLs. Applications of the measure are discussed. (Contains 3 tables and 1 figure.)