- Center for Loss in Multiple Birth (CLIMB), Inc. - By and for parents who have experienced the death of one or more, both or all, of their twins or higher multiples during pregnancy, at birth, in infancy or childhood.
- CLIMB: Saint Louis, Missouri - CLIMB is a parent support network whose members have experienced the loss of one, more, or all of their multiple birth children either during pregnancy, at birth or during infancy. Located in Saint Louis, Missouri.
- A Different Kind of Grief - A survivor of suicide speaks out about losing his twin brother.
- eLIMBO - Electronic Loss In Multiple Birth. A list for parents who have lost one or more of their multiples.
- European Twins Support Group - A site on twin loss for twinless twins living in Europe, for support, personal growth and friendship.
- Loss Of A Twin Or More - A list for parents who have lost one or more of their multiple children.
- My Angel Son's Callum and Kye - Personal story, links, photos.
- Precious TTTS Angels - A list for mothers of Twin to Twin Transfusion Syndrome babies, who have suffered the loss of one or all of their multiples.
- Twin Boys - The loss of one twin son and raising a surviving twin son.
- Twinless Twins - A list for all surviving twins, triplets, quadruplets, and quintuplets to chat, share information and stories about living without their twin.
- Twinless Twins - A support group for twins and other multiples that have experienced the death of their twin.
- Twinless Twins - Twinloss - Help twins deal with losing twin(s). Conference information, guestbook, stories, links.
