The following organisations and groups have expressed their support for the Cohabitation Act:
- Estonian Union for Child Welfare
- Open Estonia Foundation
- Estonian Women's Studies and Resource Centre
- Estonian Human Rights Centre
- Estonian Gynaecologists Society
- Estonian Academic Society for Sexology
- Estonian Medical Students’ Association
- Estonian Sexual Health Association
- Women's Support and Information Centre
- Estonian LGBT Association
- NGO SEKY (Sexual Minorities Protection Association)
- Gendy (NGO for Estonian transgender people, their friends and members of their families)
- Gay Christians' Association
- Societal Integration Centre
- Ethical Links
- Equality community "Virginia Woolf sind ei karda" (Virginia Woolf is not afraid of you)
- NGO Oma Tuba
- Facebook Page “Aitäh, aga minu traditsiooniline perekond ei vaja kaitset” (Thank you, but my traditional family does not need protection)
- Estonian Network of PLWH (People Living with HIV/AIDS)
- MTÜ Eurasian Coalition on Male Health