 On 19 November 2017, O'Neill won a second Munster Championship as Na Piarsaigh manager after a 3-15 to 2-10 defeat of Ballygunner in the final.On 17 March 2018, he guided Na Piarsaigh to a second All-Ireland final, however, his side suffered a 2-17 to 1-17 defeat by Cuala.It was later confirmed that O'Neill had stepped down as manager.