In this randomized trial study, the authors examined the efficacy of a practitioner partnership language intervention addressing oral language learning (expressive and receptive) in young language-minority learners from multiple-language groups in Norway. Resource teachers in 16 elementary schools implemented the intervention in the first and second grades, delivering a total of 64 thirty-minute sessions over eight consecutive weeks. With a mean age of 6 years 3.34 months, 137 students were randomly allocated to an intervention group or a waiting-list control group, with the latter group receiving the intervention after posttest 1. Five assessments of oral language skills were conducted before the intervention, immediately following it, and four months later. The intervention group showed significant improvements in various oral language skills compared with the waiting-list control group. There were no significant differences between the groups at the four-month follow-up when the waiting-list control group received the intervention. The program was successful in enhancing oral language skills in young language-minority learners.