Which philosopher from the nineteenth century advocated for the idea that individuals should have freedom as long as their actions do not harm others?

The philosopher who advocated for the idea that individuals should have freedom as long as their actions do not harm others is John Stuart Mill. Mill’s principle of harm is central to his ethical framework, particularly in his work "On Liberty." He argues that individuals should be free to act as they choose, provided their actions do not infringe upon the rights or well-being of others. This concept is foundational in liberal thought and has influenced discussions on personal liberty, social policy, and legal principles in modern democratic societies. Mill’s emphasis on individual liberty balanced with social responsibility is an essential aspect of his utilitarian philosophy, which seeks the greatest happiness for the greatest number while recognizing the importance of protecting individuals from harm.