Theodore B. (Ted) Siehler, 74, a Laurel businessman and former Prince George's County commissioner who had been active in civic affairs, died Oct. 13 in Pomona Park, Fla., after an apparent heart attack.

He had lived in Pomona Park, where he owned and operated a cattle ranch, since 1965, but he continued to maintain a home in Laurel, where he owned the Siehler Furniture Co. Founded by his father, Charles Henry Albert Siehler, in 1904, the store has branches in Maryland, Virginia and West Virginia.

Mr. Siehler was born and reared in Baltimore. He joined his father in the furniture business in 1922, commuting to Laurel from Baltimore, and moved to Laurel in 1928. He took over the business after his father's death in the early 1930s and since then continued to be active in it.

Mr. Siehler had been a director of the Laurel Building Association since 1936. He retired recently as a director of the Citizens National Bank of Laurel. He served as a Prince George's County commissioner from 1936 to 1944.

He was a 50-year member of the Laurel Masonic Lodge, and belonged to the Laurel Rotary and Moose clubs and Laurel Methodist Church and was a charter member of the Annapolis Yacht Club.

He is survived by his wife of 52 years, Bessie M., of Laurel and Pomona Park; a son, Theodore B. Jr., of Pomona Park; a daughter, Joanne S. Durst of Potomac; two sisters, Charlotte Koch of Baltimore, and Kathryn Willsee of Leesburg, Fla., and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Greater Laurel-Beltsville Hospital.