Walter A. (Papa Jack) Jackson Sr., 85, a retired printer at the Government Printing Office who was active in church and veterans groups, died Sunday at the Veterans Administration Hospital in Washington following a stroke.

Mr. Jackson was born in Brooklyn, N.Y., and grew up there and in Washington. He was graduated from the old M Street High School here. During World War I, he enlisted in the 351st Field Artillery Regiment of the 92nd Infantry Division and saw service in France.

After the war, he returned to Washington. In 1925, he was graduated from the Central Chiropratic College here and for the next six years practiced chiropractic medicine. He also began his career at the GPO in 1925. Hew retired in 1955.

Mr. Jackson was a member of the Nineteenth Street Baptist Church, where he was baptized in 1911. He was a secretary of the Sunday School, a member and secretary of the board of trustees, the church's disbursing officer for many years and a member of the Senior Choir and the Board of Ushers.

His activities in veterans, organizations included membership in the American Legion. He was a vice commander of the Legion's headquarters department and a member of the James Reese Europe Post No. 5. He also was a member of the Hutradenas, an organization made up of veterans of the 351st Artillery in the Washington area, and of the Veterans of World War I.

Mr. Jackson was a member of the Elks Lodge No. 85, the Free Grace Lodge No. 1343 of the Odd Fellows and the Oldest Inhabitants of the District of Columbia.

His wife, the former Rebecca Grant, when he married in 1921, died in 1974.

Survivors include a daughter, Ora J. Sidney, and a son, Walter A. Jr., both of Washington; five grandchildren, and three great-grandchildren.