Second wave or Wave 2 may refer to:
Arts and entertainment "Second Wave" (Baywatch), a 1989 television episode Hong Kong Second Wave, a group of Hong Kong film directors in late 1980s to 1990s Second Wave, a fictional terrorist group from the second season of 24
Music Second wave ska, or 2 Tone, music genre created in England in the late 1970s 2nd Wave (album), a 1988 album by Surface The Second Wave (Khoma album), a 2006 album by Khoma The Second Wave (EP), a 2021 EP by Ruger The Second Wave: 25 Years of NWOBHM, a 2003 album by British indie label Communiqué Records
Computing 802.11ac Wave 2, 2nd generation 802.11ac Wi-Fi products Wave 2, an update for Windows Live
History Second-wave feminism, a period of feminist history lasting approximately from the late 1960s through the 1980s The Second Wave: A Magazine of The New Feminism Second European colonization wave, starting in the second half of the 19th century with the New Imperialism period The deadly second wave of the Spanish flu The second wave of the COVID-19 pandemic