Major Harry Barnes (5 December 1870 – 12 October 1935) was a radical United Kingdom Liberal Party politician, architect and author specialising in housing and town planning.

The seat was a newly created constituency and his prospects of winning were helped when no Unionist opponent came forward and he was endorsed by the Coalition Government led by David Lloyd George; Despite being elected as a supporter of the government, Barnes resigned the Coalition Liberal Whip in November 1919 to take the opposition Liberal Whip.

Although he did not have a Unionist opponent, he found he was also opposed by a National Liberal supporter of the recently deposed Prime Minister, Lloyd George.

This had the effect of splitting the Liberal vote with unfortunate consequences; In December 1922 his successful Labour opponent died causing a by-election.

He did well, but not quite well enough; He contested Tynemouth again at the 1924 election, but in a difficult year for the Liberal Party his return to parliament was again thwarted; He was also involved in local government politics in London.