Opus was an American magazine that featured critical reviews of classical music recordings. Based in Harrisburg, Pennsylvania, the magazine ran bimonthly from November/December 1984 to March/April 1988, publishing 21 issues. James R. Oestreich was its editor-in-chief. Historical Times, Inc., of Harrisburg was its owner. Warren Bertram Syer (1923–2007), who had published High Fidelity for 30 years, was then the president of Historical Times.