Harold John Blackham was a leading British humanist philosopher, writer and educationalist. He has been described as the "progenitor of modern humanism in Britain".

Humanists International is an international non-governmental organisation championing secularism and human rights, motivated by secular humanist values. Founded in Amsterdam in 1952, it is an umbrella organisation made up of more than 160 secular humanist, atheist, rationalist, agnostic, skeptic, freethought and Ethical Culture organisations from over 80 countries.