HHT Ireland is an Irish registered charity supporting people and families affected by hereditary hemorrhagic telangiectasia (HHT), a rare genetic disorder that causes abnormal blood vessels and can lead to nosebleeds and arteriovenous malformations in organs. The organisation works to improve quality of life through awareness, education, community support, advocacy, and research. Its vision is for everyone living with HHT to have access to early diagnosis, effective treatment, and a supportive community.

HHT Ireland provides information about symptoms, diagnosis, treatment, and care, including resources on nosebleeds, brain, liver, and pulmonary AVMs, oral health, iron, pregnancy, and caring for children with HHT. It shares patient stories, practical guides, specialist information, and updates on research and treatment recommendations, and organises educational events and opportunities to connect with others. People can get involved by becoming members, volunteering, sharing their experiences, attending fundraising challenges and events, or donating. The organisation also offers HHT merchandise and promotes collaboration with international HHT organisations to encourage better care and understanding.