The Health Omnibus Law aims to reform the health sector. Prior to its enactment, public responses emerged in various forms, one of which was by expressing opinions on X social media. Objective: This study aims to determine public sentiment towards the Omnibus Health Law and its behaviour based on speech act theory. Method: Qualitative data was obtained retrospectively by means of text mining or extracting tweets using the hashtags #UUKesehatanOmnibuslaw and #UUKesehatan. From a total of 1,960 sent from 11 July to 31 August 2023, descriptive research was carried out with a qualitative approach on these tweets. Then classify sentiment using the Naïve Bayes algorithm and classify using speech act theory analysis. Results: 1,960 tweets were found that met the criteria. The results showed that neutral sentiment (94.13%) dominated the tweets compared to negative sentiment (3.16%) and positive sentiment (2.70%). There were 9 themes found in the tweets, with the dominant theme being ‘laws and government’. Conclusions: The results showed that the majority of tweet users were assertive and gave 'statements’ in response to the omnibus health law
                        
                        
                        
                        
                            
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