|Date of birth||1 August 1994|
|Place of birth||Westport, Ireland|
|2014||Shamrock Rovers B||15||(0)|
|2014–2017||St Patrick's Athletic||41||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 13:44, 26 March 2019 (UTC)|
O'Malley began his career with his local club Westport United in their youth team. He played for Mervue United's under 19 side for the 2011–12 season, making 2 appearances for the first team in the League of Ireland First Division. He played for Salthill Devon's under 19's for the 2012–13 season before returning to Mervue's first team, playing 8 games in the 2013 season.
In January 2014 O'Malley joined Shamrock Rovers' B team, he played 15 times for them and also made the bench for the First Team 3 times. As a result, after another year he joined St Patrick's Athletic ahead of the 2015 season. He won the 2015 League of Ireland Cup for the club, by saving 2 penalties against Galway United in the final. He played in the 2016 League of Ireland Cup Final also, as Pat's won 4–1 against Limerick to retain the title. In his 48 games for them he gained a reputation attracting the likes of Leeds United, Peterborough United and Rangers.
On 7 August 2017, O'Malley joined his old Pat's teammate Chris Forrester at League 1 side Peterborough United for an undisclosed fee expected to be in the region of €100,000. He made his debut in a 2-0 victory against Southampton Under-21s in the EFL Trophy.
He had a contract option exercised by Peterborough United at the end of the 2018–19 season.
- As of match played 19 April 2017
|Club||Season||League||National Cup||League Cup||Other||Total|
|Mervue United||2011||First Division||2||0||0||0||0||0||–||–||2||0|
|Salthill Devon||2012||First Division||0||0||0||0||0||0||–||–||0||0|
|Mervue United||2013||First Division||8||0||0||0||0||0||–||–||8||0|
|Mervue United total||10||0||0||0||0||0||–||–||10||0|
|Shamrock Rovers B||2014||First Division||15||0||–||–||–||–||–||–||15||0|
|St Patrick's Athletic||2015||Premier Division||17||0||0||0||3||0||1||0||21||0|
|St Patrick's Athletic total||41||0||0||0||5||0||2||0||48||0|
|Peterborough United||2017-18||League One||9||0||2||0||0||0||3[a]||0||14||0|
- Appearance in the EFL Trophy
- "Conor O'Malley - Goalkeeper - First Team - Peterborough United". www.theposh.com.
- "Extratime.ie - Conor O'Malley - Peterborough United". www.extratime.ie.
- "Extratime.ie - Live Updates - 2015 League Cup Final - Galway United FC -v- St. Patrick's Athletic". www.extratime.ie.
- "Saints surge late on to lift EA Sports Cup". 17 September 2016.
- Dawes, Olly. "Darragh MacAnthony suggests reason why Conor O'Malley may have chosen Peterborough United over Leeds United".
- "Peterborough United: Aaron Chapman among five transfer-listed as four released". BBC Sport. 7 May 2019. Retrieved 8 May 2019.
- "Republic of Ireland - C. O'Malley - Profile with news, career statistics and history - Soccerway". ie.soccerway.com.
- "Games played by Conor O'Malley in 2016/2017". Soccerbase. Centurycomm. Retrieved 16 July 2017.