Angelo A. Iadarola, 46, a Washington attorney who specialized in taxation, eminent domain proceedings and Indian claims, died Monday at Johns Hopkins Hospital in Baltimore. He had leukemia.

In one recent proceeding Mr. Iadarola, who was a partner in the firm of Wilkinson, Cragun & Barker, represented the Klamath Indian tribe, some of whose timber properties in Oregon were taken by the federal government.

The government paid the tribe $49 million for the land. The tribe retained Mr. Iadarola and his firm to sue for a higher amount. On March 3 the government agreed to pay the Klamath tribe an additional $81.5 million.

In his tax work, Mr. Iadarola represented nonprofit foundations and trusts. He also represented owners of large tracts of timberland in the South and the West in cases in which the government wished to take the land through eminent domain proceedings.

Mr. Iadarola was chairman of the D.C. Bar Association's committee on the U.S. Court of Claims. The bar association gave him its Chairman of the Year Award in 1978.

Mr. Iadarola was born in New York City. He studied accounting and was a graduate of the University of Connecticut. He later entered Georgetown University law school and was on the staff of the Georgetown Law Journal. He earned a master's degree in taxation from Georgetown in 1963. He was a former associate editor of The Young Lawyer, a publication of the D.C. Bar Association.

He joined Wilkinson, Cragun & Barker in 1960 and had been a partner since 1965.

Survivors include his wife, the former Sally Windust, and three children, Amy Catherine, Brent Anthony and Cara Anne, all of Potomac, where the family lives; his father, Antonio Iadarola of Shelton, Conn., and six sisters, Michelina De Stefano, Elisa Lopilato, Nancy Aldo, Sister Antoinette Iadarola, Dolores Tema and Mary Ann Iadarola, all of Connecticut.

The family suggests that expressions of sympathy be in the form of contributions of Medicine, Johns Hopkins Hospital, Baltimore.