Frank C. Daniel Jr., 68, a retired secretary of the National Rifle Association and a lifelong area resident, died of cancer Jan. 18 at Georgetown University Hospital. He lived in Lorton, Va.

Mr. Daniel joined the NRA as its office manager in 1940. Three years later, he became advertising manager of The American Rifleman, the organization's monthly magazine. He also served as director of legislative information services and of club activities. He was secretary of the NRA for 22 years before retiring in 1976.

He was a past treasurer of the U.S. Pentathalon Association and was a member of the American Ordnance Association, the National Recreation Association and the Wilderness Society.

Mr. Daniel was a native of Washington and was a 1936 graduate of George Washington University. He worked for the National Target & Supply Co. here before joining the NRA. He served with the Navy in the Pacific during World War II.

His wife, Catherine Davis Daniel, died in 1969. Mr. Daniel's survivors include three daughters, Lynne Pegelow of Stafford, Va., Catherine Satterfield of Oakwood, Ga., and Patricia Westover of Woodbridge, Va.; three sisters, Deborah Kaylor of Aldie, Va., Helen Waller of Lorida, Fla., and Jane Baker of North Carolina; a brother, John, of Front Royal, Va., and eight grandchildren.