The bachelor thesis entitled Speech therapy intervention of dyslalia in the clinical speech therapist's ambulance provides an insight into the work of a clinical speech therapist with a child with dyslalia in preschool age. The theoretical part of the thesis deals with the definition and division of dyslalia, speech development and speech therapy. The practical part of the work presents the work of the clinical speech therapist from the admission of the child to care, through the speech therapy diagnosis to the course of speech therapy of dyslalia (preparatory exercises, elicitation, fixation, automation of sounds). In order to achieve a comprehensive view of the speech therapy intervention, the empirical part also includes the analysis of semistructured interviews with the child's legal representative and the child's kindergarten teacher. This bachelor thesis can serve speech therapy assistants or parents involved in the correction of articulation deviations based on speech therapy diagnosis and clinical speech therapist's recommendations.