nˈoʊ. twˈɛnti fˈaɪv skwˈɑːdɹən wʌz fˈɔːɹmd æt ɹˈɑːf stˈeɪʃən lˈævɜːtən ɪn vɪktˈoːɹiə, ˌɔn θɹˈiː mˈeɪ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɛvən ænd wʌz ɪnˈɪʃəli nˈoʊn æz "nˈoʊ. twˈɛnti θɹˈiː sˈɪɾi ʌv pˈɜːθ skwˈɑːdɹən".
No. 25 Squadron was formed at RAAF Station Laverton in Victoria, on 3 May 1937 and was initially known as "No. 23 (City of Perth) Squadron".