In the Year 2525

"In the Year 2525 (Exordium & Terminus)" is a 1969 hit song by the American pop-rock duo of Zager and Evans. It reached number one on the Billboard Hot 100 for six weeks commencing July 12, 1969. It peaked at number one in the UK Singles Chart for three weeks in August and September that year. The song was written and composed by Rick Evans in 1964 and originally released on a small regional record label (Truth Records) in 1968. It was later picked up by RCA Records. Zager and Evans disbanded in 1971.

Due to Zager and Evans never releasing another charting single, it in turn effectively made them one-hit wonders. This occurred in both the U.S. Billboard Hot 100 and the UK Singles Chart and as of 2022, they are the only recording artists ever to have a chart-topping number one hit on both sides of the Atlantic and never have another charting single in the US (on the Billboard Hot 100) or the UK for the rest of their career. Their follow-up single on RCA Victor, "Mr. Turnkey", reached number 48 in the Canadian pop charts and number 41 in the Canadian AC chart. Another single, "Listen to the People", managed to make the bottom slot of the Cashbox chart at number 100 and number 96 in Canada.