Wow! is the fourth studio album by the English group Bananarama, released on 7 September 1987 by London Records. The album was entirely produced and co-written with the Stock Aitken Waterman production trio. Tensions between group member Siobhan Fahey and Stock, Aitken and Waterman regarding songwriting input and lyrical content prompted Fahey's departure from Bananarama five months after its release. The album reached number 26 on the UK Albums Chart and number 44 on the US Billboard 200, while peaking at number one in Australia. The album was certified gold by the British Phonographic Industry (BPI) on 3 February 1988.