On 24 June 2013, Hammill rejoined Huddersfield Town in a permanent deal for an undisclosed fee, signing a three-year deal (with a further year's option) with the Terriers. Upon joining the club, Hammill was given number twelve shirt. He made his second debut for the club as a substitute in the 1–0 defeat by Nottingham Forest on 3 August 2013. He scored his first goal in his second spell in the 5–1 win over Bournemouth on 24 August 2013, and three days later, on 27 August 2013, Hammill scored again, which turned out to be a winning goal, in a 3–2 win over Charlton Athletic in the second round of League Cup. His impressive performance then earned him October Player of the Month. Hammill later scored three more goals later in the season against Barnsley, Blackburn Rovers and Middlesbrough. In an aftermath 2–1 loss against Wigan Athletic, Hammill was fined by the club after expressing frustrating when he was substituted. Since returning to the club, Hammill has excelled in the new 3–5–2 formation as a right wing-back. Despite suffering ankle injury, Hammill went on to make forty–nine appearance and scoring five times and assisting twelve times in all competitions.