E. Roy Haller Jr., 59, a retired assistant manager and treasurer with the Suburban Trust co., died Friday at the Washington Adventist Hospital in Takoma Park. He had a brain tumor.

Mr. Haller was born in Washington and grew up in Hillside, Md. He graduated from Maryland Park High School.

He began his banking career in 1943 with the old Bank of Maryland, which later merged with Suburban Trust. He was manager and treasurer of the Capitol Heights branch from 1954 until its closing in 1970. He then was assistant manager and treasurer in the Upper Marlboro office. At the time of his retirement in 1977, he was assistant manager and treasurer of the Hillcrest Heights branch.

Mr. Haller was a member of St. Matthews Episcopal Church in Seat Pleasant. He also had served as an assistant treasurer of the Addison Chapel Foundation Inc., which supports the historic Addison Chapel on the grounds of St. Matthews.

Survivors include his father, E. Roy Sr., of the home in Hillside; two brothers, Paul G., also of the home and Edward A., of Temple Hills, Md., and six sisters, Jane Wencel and Virginia Grimley, both of Temple Hills, Lois Adams and Pat Vider, both of Hillcrest Heights, Jeannette Wilt, of Colorado Springs, Colo., and Ida Chichester of Manassas, Va.

The family suggests that expressions of sympathy be in the form of contributions to the Addison Chapel Foundation Inc., c/o John Boertleine, 2549 Oak Glen Way, Forestville, 20028.