<p>This paper examines the implications of brain–machine interfaces (BMIs) from a libertarian perspective, arguing that their widespread use necessitates careful scrutiny due to potential risks to individual autonomy, freedom, privacy, and dignity. BMIs, while offering significant technological advancements, pose severe threats by potentially undermining fundamental libertarian values. The paper discusses how BMIs could enable invasive surveillance, thought manipulation, and emotional control, drawing parallels to Robert Nozick’s Experience Machine thought experiment. Unlike the hypothetical machine, which offers simulated experiences, BMIs could facilitate real-time control over individuals’ thoughts and emotions, leading to unprecedented forms of government overreach and coercion. The paper concludes that although libertarians advocate for minimal state intervention, the profound impact of BMIs on personal freedom and autonomy warrants a cautious approach, including potential restrictions on their use to safeguard against their misuse and to preserve individual self-ownership and dignity.</p>