Dr. Thomas F. Dwyer, 43, president of his own engineering and communications company and a technical consultant to the government, died Sunday at the home of his mother, Elizabeth B. Dwyer, in Baltimore. He had cancer.

Dr. Dwyer founded Dwyer Associates Inc. in Severna Park, in 1976. The company conducts engineering and communications studies for computer companies and government agencies. In addition to this, he had been a technical consultant to the Naval Research Lab for the past five years.

Dr. Dwyer was a native of Baltimore and a resident of Severna Park. He graduated magna cum laude from Loyola College in Baltimore, where he earned a degree in engineering and physics. He earned a doctoral degree in electrical engineering at Princeton University in 1966.

In 1967, he returned to this area and joined the technical staff of the ARINC Research Corp., a communications firm. From 1969 until starting Dwyer Associates, he was director of antisubmarine warfare and ocean surveillance with the Naval Security Group in Washington.

Dr. Dwyer was a member of Our Lady of the Fields Catholic Church in Millersville, Md.

In addition to his mother, survivors include his wife, Regina, a son, Thomas P., and two daughters, egina E. and Sarah M., all of Severna Park, and three sisters, Mary Corrigan of Philadelphia, Elizabeth Layne of Baltimore, and Jane Villarreal of San Diego, Calif.

The family suggests that expressions of sympathy be in the form of contributions to the Thomas F. Dwyer Memorial Fund at Loyola College in Baltimore.