Leader of the Opposition is a constitutionally sanctioned office in Papua New Guinea.
It originates from Westminster role for a leader of the opposition.
The Constitution defines the role "for a member of the Parliament of Papua New Guinea as being the principal speaker on behalf of those members of the Parliament who are not generally committed to support the government".
[1] It is claimed that Michael Somare became the first official leader of the opposition in 1968.
[2]