The title-winning striker scooped almost a third of the votes for his strike against Boreham Wood - a goal which ultimately sealed the title for the Welsh side.
Mullin was closely followed by one of his teammates - with Elliott Lee (17.9%) and Mike Fondop (15.8%) in second and third respectively.
See the winning goal here!
Voting Totals - National League Goal of the Season
Goal 1 – Rohan Ince (Woking) v Dorking Wanderers (A) - 3%
Goal 2 – Jeff King (Chesterfield) v Southend United (H) - 9.3%
Goal 3 – Aden Baldwin (Notts County) v Boreham Wood (H)- 4.7%
Goal 4 – Quevin Castro (Notts County) v York City (A) - 3.6%
Goal 5 – Paul Mullin (Wrexham) v Boreham Wood (H) - 29%
Goal 6 – Idris Kanu (Barnet) v Wrexham (A) - 6.5%
Goal 7 – Elliott Lee (Wrexham) v Oldham Athletic (H) - 17.9%
Goal 8 – Reece Smith (Maidenhead United) v Wrexham (H) - 4.2%
Goal 9 – Nicky Wheeler (Dorking Wanderers) v Torquay United (A) - 5%
Goal 10 – Danny Whitehall (Eastleigh) v Southend United (H) - 4.2%
Goal 11 – Macaulay Langstaff (Notts County) v Maidenhead United (A) - 4.4%
Goal 12 – Mike Fondop (Oldham Athletic) v Dorking Wanderers (A) - 15.8%