|Full name||Niall Callum James Peter Maher|
|Date of birth||31 July 1995|
|Place of birth||Manchester, England|
|2015||→ Blackpool (loan)||10||(0)|
|2018||AFC Telford United||1||(0)|
|2018–2022||FC Halifax Town||148||(6)|
|*Club domestic league appearances and goals, correct as of 18:49, 10 September 2023 (UTC)|
He has previously played in the Football League for Bolton Wanderers, Blackpool and Bury, as well as in the League of Ireland with Galway United and in non-League football with AFC Telford United and FC Halifax Town. He was voted as part of the National League Team of the Year for 2021–22.
On 22 January 2015, Maher joined Blackpool in a one-month loan and he made his Football League debut as a 57th-minute substitute for Peter Clarke on 24 January 2015 in a 7–2 loss against Watford at Vicarage Road.
At the end of the 2015–16 season, Bolton confirmed that he would be leaving when his contract expired at the end of June. On 24 July 2016 it was confirmed that he had joined Bolton's close neighbours Bury on a twelve-month contract. He scored his first goal for Bury against Burton Albion in an EFL Cup tie on 10 August 2016.
AFC Telford United
FC Halifax Town
On 8 March 2018, Maher signed for National League side FC Halifax Town on a deal until the end of the 2017–18 season. On 18 August 2018, Maher extended his stay by agreeing a new two-year deal.
Halifax announced on 17 August 2020 that Maher extended his deal for a further two years.
Ahead of the 2021–22 season Maher was installed as the new club captain, replacing the departing Nathan Clarke. After advancing to the play-offs following a 4th place finish, Halifax were defeated by Chesterfield in the eliminator round, thus ending their bid to reach the Football League. Maher was voted into the National League Team of the Season.
On 6 June 2022, Maher announced he would be leaving Halifax following the conclusion of the 2021–22 season, he stated upon his departure "To be your captain over the last 18 months has been a massive honour. To the players - it's been one hell of a season with a great dressing room to manage and there is no doubt that you all deserve to be achieving the best in your careers whatever they may be."
On 15 June 2022, following their promotion to the Football League, Maher signed for Grimsby Town ahead of the 2022–23 season,  reportedly rejecting an offer from Oldham Athletic who were hopeful of signing him.
Maher was part of the Grimsby team that reached the FA Cup quarter final for the first time since 1939, he played the full 90 minutes of the 2–1 win away at Premier League side Southampton that secured that achievement.
- As of end of 2022–23 season
|Club||Season||League||FA Cup||League Cup||Other||Total|
|Galway United||2017||Premier Division||5||0||—||—||0||0||5||0|
|AFC Telford United||2017–18||National League North||1||0||0||0||—||0||0||1||0|
|FC Halifax Town||2017–18||National League||9||0||0||0||—||0||0||9||0|
|Grimsby Town||2022–23||League Two||35||3||6||0||0||0||3[d]||0||44||3|
- "The Football League Retained List". The Football League. 12 June 2015. Retrieved 16 June 2015.
- Pye, David (4 April 2013). "Youth coach Lee hails Whites academy after trio get deals". The Bolton News. Retrieved 13 February 2015.
- "Bolton v Reading". BBC Sport. 2 April 2016. Retrieved 2 April 2016.
- "Niall Maher: Blackpool sign Bolton Wanderers full-back on loan". BBC Sport. 22 January 2015. Retrieved 13 February 2015.
- "Watford 7-2 Blackpool". BBC Sport. 24 January 2015. Retrieved 13 February 2015.
- "Bolton Wanderers confirm player departures". bwfc.co.uk. 13 May 2016. Retrieved 13 May 2016.
- "CONFIRMED: Maher arrives in Bury". buryfc.co.uk. 25 May 2016. Retrieved 28 May 2016.
- "Burton 3-2 Bury". BBC Sport. 10 August 2016. Retrieved 11 August 2016.
- "Niall Maher signs for Galway United". 29 August 2017.
- "New-boy Niall Maher chasing another AFC Telford triumph".
- "Niall Maher: An Opportunity I Couldn't Turn Down".
- "Maher signs new contract with Halifax". BBC Sport.
- "FC Halifax Town: Defender Maher agrees new deal with Shaymen".
- "FC Halifax Town: Maher named as new Shaymen skipper".
- ""We've achieved what we wanted to at the start of the season" - Niall Maher's captain's column".
- "'Great from Hurst' - Grimsby Town supporters react to Niall Maher signing". Grimsbylive. 15 June 2022.
- "FC Halifax Town skipper Maher pays tribute to fans as he announces departure from club".
- "Maher Becomes First Summer Signing - Grimsby Town Football Club". 15 June 2022.
- "Latics miss out on ex-Bolton and Blackpool defender Niall Maher".
- "Grimsby stun Southampton to reach FA Cup last eight". BBC Sport.
- "Brighton end Grimsby's run to reach FA Cup semis". BBC Sport.
- "Games played by Niall Maher in 2014/2015". Soccerbase. Centurycomm. Retrieved 13 February 2015.
- "Games played by Niall Maher in 2015/2016". Soccerbase. Centurycomm. Retrieved 13 February 2015.
- "Games played by Niall Maher in 2016/2017". Soccerbase. Centurycomm. Retrieved 11 September 2021.
- "Games played by Niall Maher in 2017/2018". Soccerbase. Centurycomm. Retrieved 11 September 2021.
- "N.Maher". Soccerway. Retrieved 6 June 2023.
- "Games played by Niall Maher in 2022/2023". Soccerbase. Centurycomm. Retrieved 6 June 2023.