During its existence the Grand Army of the Republic (GAR) was aided in its work by five organizations, which are now referred to as the Allied Orders of the GAR.
- Woman’s Relief Corps
The official woman’s auxiliary of the GAR. Organized in 1883, membership is open to all women, regardless of ancestry, who ascribe to the principles of the Order.
- Ladies of the Grand Army of the Republic
An organization of ladies who trace their ancestry to a Union Civil War soldier, sailor, Marine or member of the Revenue Cutter Service. They meet in groups called Circles.
- Daughters of Union Veterans of the Civil War
Women with Union Civil War ancestors who either belonged to or could qualify for membership in the GAR are welcome to join a Tent of this Order.
- Sons of Union Veterans of the Civil War
The SUVCW was created in 1881 by the GAR. Membership is open to men who have an ancestor who either belonged to or was eligible to join the GAR (i.e., a Union Civil War veteran). A limited number of Associates may be part of a Camp. Associates are men who otherwise qualify for membership except for the existence of a Union Civil War ancestor.
- Auxiliary to the Sons of Union Veterans of the Civil War
Created in 1887, membership is open to women with Union Civil War veterans as ancestors as well as to spouses and daughters of members of the Sons of Union Veterans of the Civil War.