The charity formerly known as the National Association for Colitis and Crohn's Disease (NACC) has been renamed as Crohn's and Colitis UK.
The new name has been prompted by the need for greater clarity and easier recognition among the estimated quarter of a million people across the UK who have ulcerative colitis or Crohn's disease (known, together, as inflammatory bowel disease), whom the charity offers support.
Last year, the charity provided information and support to thousands of families and made grants of £500,000 towards research.
Crohn's and Colitis UK Chief Executive, Richard Driscoll, said: "We are excited by the prospect of taking the charity forward into our 31st year with a fresh look to the working name and brand.
"Our values, vision and priorities have not changed – but the change of name gives us the chance to maintain and develop the prestige and affection achieved by our current brand.
"We promise to continue the service quality that is our hallmark, taking our membership with us on the journey, but also attracting new members and generating greater awareness along the way.