An unincorporated association is a group of people who have come together for a particular purpose, who are not seeking to make a profit and do not want to follow a formal structure.
Mae cymdeithas anghorfforedig yn grŵp o bobl sydd wedi dod at ei gilydd at ddiben penodol, nad ydynt yn ceisio gwneud elw ac nad ydynt am ddilyn strwythur ffurfiol.