The Senior Unofficial Member, later Senior Member and, finally, Convenor of the Non-official Members, was the highest-ranking unofficial member of the Legislative Council (LegCo) and Executive Council (ExCo) of British Hong Kong, which was tasked with representing the opinions of all unofficial members of the council to the Governor.

Ethnic Chinese members of either council were frequently referred to as "Chinese representatives" of the council before the introduction of elected seats in the LegCo; the most senior ethnic Chinese member was dubbed the "Senior Chinese Unofficial Member" (Chinese: 首席華人非官守議員) or "Senior Chinese Representative".

The Executive Council and the Legislative Council were set up in 1843, initially composing of colonial administrators only. The councils were initially chaired by the Governor of Hong Kong. The colony's residents remained unrepresented until 1850, when the government appointed two businessmen to the LegCo, with David Jardine of Jardines as the first Senior Unofficial Member of the LegCo in the history of Hong Kong. It was not until 1896, on his appointment to ExCo, that Catchick Paul Chater became the Senior Unofficial Member.

Historically, ExCo Senior Unofficial Member importance greatly exceeded that of the LegCo counterpart, thus their term of office were longer. Before the Second World War, there were only three Senior Unofficial Members in ExCo, whereas there have been four LegCo Senior Unofficial Members. Initially, membership was restricted to Europeans; ethnic Chinese were admitted at a later date. The first ethnic Chinese to be appointed LegCo Senior Unofficial Member was Ho Kai, who held the post from 1906 to 1914. The first ethnic Chinese to be appointed ExCo Senior Unofficial Member was Chau Tsun-nin, who held the post from 1953 to 1959. Prior to Chau Tsun-nin, Chow Shouson was also ExCo Senior Unofficial Member when he stood in for three months following Henry Pollock.

Senior Unofficial Members of the ExCo would customarily be knighted if they were not already knights, although their LegCo counterparts would not. Pre-WWII ExCo and LegCo Senior Unofficial Member typically served renewable four- to five-year terms. Their seniority implied they would not remain as ordinary Legco/Exco members at the end of their terms, but would leave the council on expiry.

In 1985, indirect elections were introduced for the Legislative Council. To avoid confusion, Sir Edward Youde, the then-Governor, renamed the post Senior Unofficial Member in both councils "Senior Member". The introduction in 1991 of direct elections to the LegCo more than doubled the number of its members. The directly elected members refused to take orders from the Senior Member. The Senior Member at the time, Allen Lee, was unable to represent the council with a single voice and would occasionally have run-ins with the directly elected members. In 1992, Governor David Wilson abolished the LegCo post of Senior Member. In 1995, Governor Chris Patten renamed the ExCo post of Senior Member "Convenor of the Non-official Members".

During colonial times, the Urban Council also had a post entitled "Senior Unofficial Member", with a similar role. However, its importance was considerably less than its ExCo and LegCo counterparts.

In total there have been 26 and 11 Senior Unofficial Members respectively of LegCo and ExCo. Of these, six have served as Senior Unofficial Members in both councils: Catchick Paul Chater, Sir Henry Pollock, Chau Tsun-nin, Kan Yuet-keung, Chung Sze-yuen and Lydia Dunn.

The longest serving Senior Unofficial Members of LegCo were Sir Henry Pollock and Phineas Ryrie, who sat for 24 and 22 years respectively; the three who served the shortest duration were George Lyall, John Dent and Kwok Chan, who sat for one year. Lydia Dunn was the only female; Dhun Jehangir Ruttonjee was the only Parsee; Roger Lobo was the only Portuguese.

The longest serving Senior Unofficial Members of ExCo was Catchick Paul Chater, who served a total of 30 years; the shortest tenures was Sir Sidney Gordon, serving under one year. Lydia Dunn was the first female ExCo Senior Unofficial Member. Chater was the only Senior Unofficial Member to die in office; Chau Tsun-nin and Chau Sik-nin were the only Senior Unofficial Members drawn from the same clan.

• Executive Council of Hong Kong
• Legislative Council of Hong Kong
• Senior Chinese Unofficial Member
• Unofficial Member
• Father of the House