Victor C. Smiroldo, 47, executive director and general counsel of the House Post Office and Civil Service Committee died in his office on Capitol Hill Tuesday following a heart attack.

Mr. Smiroldo had been a member of the committee's staff since 1969, and had been its director since 1973. Since 1974, he also had served as the unpaid staff director and counsel of the Commission on Congressional Mailing Standards, which supervises the use of franking privileges by members of Congress.

The House committee employing Mr. Smiroldo deals primarily with pay scales and work conditions for members of the federal civil service. It also supervises the postal service under the terms of the Postal Office Reorganization Act of 1970. Under that act, postal employes now negotiate their own contracts.

Mr. Smiroldo was responsible for administering a committee budget exceeding $1 million and for supervising a staff of about 50 persons. He also worked directly with members of Congress on the committee and others on legislative matters, and was regarded as an expert in his field.

"We lost a good friend," said Emmett Andrews, general President of the American Postal Workers Union. "He was a very knowledgeable guy and a pleasure to work with."

Mr. Smiroldo was born in Angola, N.Y. He earned a business degree from Canisius College in 1952, and then served two years in the Army. He operated his own insurance agency in Buffalo, N.Y., from 1954 to 1959. At the same time, he attended the University of Buffalo Law School and graduated in 1959.

He practiced law in Buffalo until he came to Washington to join the Post Office and Civil Service Committee in 1969. He joined the committee at the request of former representative Thaddeus J. Dulksi (D-N.Y.), who was then the committee chairman.

Mr. Smiroldo's survivors include his wife, Rosemarie, and four children, Diane Marie, Denise Marie, Victor Charles Jr. and Sandra Marie, all of the home in Vienna.