Dina Wallach Block, 98, widow of Paul Block Sr., a leading American chain newspaper publisher and philanthropist, died Friday at her Park Avenue home. The cause of death was not reported.

The daughter of a real estate developer and a native New Yorker, Mrs. Block had lived in New York since her husband's death in 1941.

She married Paul Block Sr. in 1907, 10 years after he had established Paul Block and Associates, national advestising representatives for independent newspapers.

At the time of his death at age 63, Block also was publisher of the Pittsburgh (Pa.) Post-Gazette, the Toledo (Ohio) Blade and the Toledo Times. At various times he headed numerous other papers, including the New York Evening Mail, Newark-Star-Eagle, and Brooklyn Standard-Union, which were part of Paul Block Newspapers, and Los Angeles Express and Detroit Journal.

Mrs. Block often entertained her husband's clients and business associates at the couple's estate, "Friendship," in Purchase, N.Y.

Today, the Block Newspapers include the Toledo Blade, the Pittsburgh Post-Gazette, and the Monterey (Calif.) Peninsula Herald. Paul Block and Associates has been involved in numerous mergers, and is now known as Branham Newspaper Sales.

Mrs. Block's survivors include two sons, Paul Jr. and William, co-publishers of Block Newspapers, seven grandchildren and five great-grandchildren.