Tommy Herron (1938 – 14 September 1973) was a Northern Ireland loyalist and a leading member of the Ulster Defence Association (UDA) until his death in a fatal shooting. Herron controlled the UDA in East Belfast, one of its two earliest strongholds. From 1972, he was the organisation's vice-chairman and most prominent spokesperson, and was the first person to receive a salary from the UDA.

Herron was born in 1938 in Newcastle, County Down to a Protestant father and a Roman Catholic mother. According to Martin Dillon, Herron was baptised in St Anthony's Catholic Church on Belfast's Woodstock Road as a baby. Gusty Spence has suggested that Herron, like Shankill Butcher Lenny Murphy, took on the mantle of a "Super Prod", or individual who acts in an affectedly extreme Ulster Protestant loyalist way, to deflect any potential criticism of his Catholic roots. Herron was a member of the Free Presbyterian Church of Ulster and regularly attended services at the Martyrs' Memorial Church, the group's headquarters on the Ravenhill Road in south-east Belfast. He worked as a car salesman in East Belfast and was married to Hilary Wilson, by whom he had five children.

Herron was a leading member of the UDA, which was the largest loyalist paramilitary organisation in Northern Ireland, from its formation and emerged at the group's top man in East Belfast. A thirteen-member Security Council was established in January 1972 with Herron a charter member of this group, although control lay in the west of city with Charles Harding Smith emerging as chairman of the new body. Along with the likes of Billy Hull, Herron was one of a handful of UDA leaders to be invited to meetings with Secretary of State for Northern Ireland William Whitelaw after the suspension of the Parliament of Northern Ireland in March 1972.

By this time Herron had come to see himself as the most powerful figure in the UDA and had begun to make statements on behalf of the movement unilaterally. In September 1972, the British Army intervened to defend a Catholic area of Larne against loyalists.^{[citation needed]} British Army vehicles ran down two civilians in East Belfast, one of whom was believed to be a UDA member. Under the name of the Ulster Citizen Army, Herron declared war on the British Army. He called this off after two days of gunfire due to a lack of support, two more loyalists having been killed.

Herron's decision to go against the British Army, as brief as it was, as well as the looting and rioting that was taking place in Belfast under the direction of Herron and his close ally Jim Anderson as a reaction to the loyalists' deaths, saw both his stock and that of the Belfast UDA fall somewhat locally. Protestant clergymen petitioned the UDA to end the street violence whilst middle class Protestants, as well as politicians such as Roy Bradford, loudly condemned the attacks on the British Army, which traditionally enjoyed a high reputation amongst Northern Irish Protestants. On 20 October 1972 Herron sent word to Colonel Sandy Boswell, the army commander in Belfast, that the trouble would end and it was to the relief of many that Herron left Belfast the following month, in the company of Billy Hull, to launch a tour of Canada promoting loyalism.

For much of 1972 Herron's main rival Charles Harding Smith, the leader of the West Belfast UDA, was absent from the scene after being arrested in England on gun-running charges. During his absence control on West Belfast went into the hands of Davy Fogel and his ally Ernie Elliott, both of whom had been influenced to varying degrees by left-wing rhetoric. Whilst Herron was not involved in initiatives by both men that saw dialogue with the Catholic Ex-Servicemen's Association of Ardoyne or the Official IRA he did accompany them to a meeting with representatives of the British & Irish Communist Organisation which, unusually for communist groups, followed a staunchly unionist position with regards Northern Ireland.

Herron also garnered a reputation for his involvement in racketeering, something that Harding Smith had strongly condemned. In early 1973 an east Belfast publican was interviewed anonymously by The Sunday Times and he claimed that Herron would regularly send one of his men to the pub to ask for a contribution to the "UDA prisoners' welfare fund". The publican stated that he knew if he refused to contribute his windows would be smashed or the pub shot at, making the fund simply a protection racket. Herron was apparently asking as much as £50 per week from each pub with shop owners expected to pay half that amount.

After his return from England Harding Smith immediately clashed with Fogel but, somewhat surprisingly given their personal enmity, Herron sided with Harding Smith in the struggle. Herron summoned Fogel to his east Belfast office on 13 January 1973; when Fogel arrived, he was placed under arrest and detained for several hours. Herron told Fogel that he could only remain in charge of Woodvale if he agreed to accept Harding Smith's leadership in West Belfast as a whole. Fogel would leave Belfast altogether soon after this episode. In February, Herron called for a general strike against the British Government's decision to introduce internment for suspected loyalist parliamilitaries, mirroring the existing internment for suspected republican paramilitaries. This led to a day's fighting on the streets.^{[citation needed]}