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Background: There is a clear predominance of programmes aimed at improving aspects related to language production in pupils with developmental language disorder (DLD). However, programmes aimed at improving their receptive skills are limited. Aims: The main aim was to assess the effectiveness of an intervention programme for oral language comprehension skills in preschoolers with typical development (TD) and pupils with DLD. Methods & Procedures: Participants were 99 five-year-old pupils, with and without DLD, divided into four groups: two control groups (TD-C = 25; DLD-C = 25) and two experimental groups (TD-T = 24; DLD-T = 25), from schools on the Spanish island of Tenerife. The study used, as pre- and post-measures, the receptive language subtests of the CELF-4-Spanish: "Concepts and Following Directions, Word Classes--Receptive and Sentence Structure," as well as two tasks assessing comprehension of paragraphs and narratives. Due to the strong link between oral comprehension skills and executive functions, working memory and semantic fluency are included in this research. The "Backward Digit Span" subtest of the Wechsler Intelligence Scale for Children (WISC-IV) and "Semantic Fluency" subtest of the Controlled Oral Word Association Test (COWAT) were used to assess working memory and semantic fluency, respectively. The intervention programme followed a multitiered system of support (MTSS) model, with 95 sessions lasting 60 min each delivered jointly by teachers and speech and language therapists, and focused on lexical-semantic, morphological, syntactic and narrative skills; inferences; verbal working memory; and semantic fluency. Outcomes & Results: The results showed, as expected, that pupils diagnosed with DLD initially performed worse on oral language comprehension and executive functions than pupils with TD. Further, the DLD-T and TD-T groups showed greater gains following the programme, especially in word classes--receptive, sentence structure, verbal working memory and semantic fluency. Finally, a significant positive correlation was found between the gains obtained by the participants in verbal working memory and semantic fluency, with the gains obtained in the three CELF-4-Spanish subtests. Conclusions & Implications: An intervention programme applied at an early age fosters oral language comprehension skills and executive functions in pupils with DLD and TD. The intervention organized at different levels of support, following an MTSS model, showed clear progress of the DLD and TD groups in oral language comprehension and executive functions.