The Core Issues Trust is a British Christian fundamentalist organisation that provides conversion therapy for LGBT people.

[4] In June 2011, the Core Issues Trust organized a one-day event in a church in Belfast entitled "Interrogating the Pejoratives: Considering Therapeutic Approaches and Contexts for those Conflicted in Sexual Identity".

Although the campaign was passed by the Committee of Advertising Practice, it was subsequently banned by then- London Mayor Boris Johnson.

The Trust lodged a further case in the High Court in January 2014, alleging that Johnson had unlawfully used his position to ban the ad.

[14] In May 2020, the National Secular Society lobbied the Northern Ireland Executive over the charitable status of the group, writing "Bogus therapies which encourage people to change or suppress their sexuality are harmful and widely discredited.