Twentieth Century is the fifth and final studio album by Australian band Cold Chisel until the group reformed in 1998. The album was written and recorded over various sessions during the period of the band's break-up and during breaks in their final tour. It was released in early 1984 and peaked at No. 1 on the Australian albums chart, their third consecutive album to do so. It charted for a total of 46 weeks.

Cold Chisel are an Australian pub rock band, which formed in Adelaide in 1973 by mainstay members Ian Moss on guitar and vocals, Steve Prestwich on drums and Don Walker on piano and keyboards. They were soon joined by Jimmy Barnes on lead vocals and, in 1975, Phil Small became their bass guitarist. The group disbanded in late 1983 but subsequently reformed several times. Musicologist Ian McFarlane wrote that they became "one of Australia's best-loved groups" as well as "one of the best live bands", fusing "a combination of rockabilly, hard rock and rough-house soul'n'blues that was defiantly Australian in outlook."