In addition to the CPL, Forge competed in the Canadian Championship where it defeated MLS opposition for the first time by prevailing against CF Montréal over two legs in the quarterfinal, advancing the club to the semifinal for the second consecutive year.

[5] In the 2023 edition, Forge reached the semifinal where they were knocked out by Major League Soccer (MLS) club CF Montréal for the third consecutive year.

[6] Forge qualified for the 2024 CONCACAF Champions Cup on October 21, 2023,[7][8] returning the club to international competition after a one-year absence.

[10] Head coach and sporting director Bobby Smyrniotis returned for his sixth season after signing a contract extension in 2023.

[13] This changed a week later when defender Manjrekar James, who was originally listed to return, was sold to Costa Rican side Alajuelense for an undisclosed fee.

[14] The club later announced that it had picked up the contract options of midfielder Sebastian Castello, defender Malcolm Duncan, and goalkeeper Christopher Kalongo.

[15][16] On January 29, Forge re-signed Swedish midfielder and club original Alexander Achinioti-Jonsson to a multi-year deal.

[17] Over the following days, the club announced the return of versatile Senegalese midfielder Elimane Cissé, who was a member of Forge's 2019 and 2020 championship teams, and signed Ghanaian international forward Nana Ampomah, both to multi-year deals.

[20][21] Striker Woobens Pacius announced on December 17 that he was departing Forge, with the club confirming that he was out of contract;[22][23] he later signed with MLS side Nashville SC.

[24] On January 17, full-back Rezart Rama left the club, signing with KF Egnatia in the Albanian top flight.

[16][25] Midfielder Aboubacar Sissoko left Forge to join fellow Ontario side Atlético Ottawa.

[28] Facing an uphill battle in the second leg at the Estadio Akron, Forge lost 2–1 to Chivas to be defeated 5–2 on aggregate, knocking them out of the Champions Cup.

[29] Forge was notably without Golden Glove winning goalkeeper Triston Henry for both matches; according to the club, he was away dealing with a personal matter.

[35] Henry, Cissé, and Ampomah continued to be unavailable for the Hammers, while defender Garven Metusala missed the match due to injury.

Forge's 2024 Canadian Championship run began on May 1 with a rematch against York United FC, this time at Tim Hortons Field.

[45] Jordan Hamilton scored a brace as part of a three goal first half en route to a convincing 3–1 win, advancing Forge to the quarterfinals.

[52] However, they only managed to score one goal against the Hammers, resulting in a "historic" 2–1 Forge win and advancing them to the semifinals 3–2 on aggregate.

[56] Kyle Bekker, Tristan Borges, and Daniel Parra scored for Forge while Kwasi Poku contributed with two assists and a crucial goal-line clearance to help Jassem Koleilat keep the clean sheet.

[61] After a delay in getting his work permit approved,[62] Nana Ampomah made his long-awaited debut for Forge, appearing as a second-half substitute and assisting on Poku's late equalizer.

[64] In a "chaotic" and "thrilling" contest, Atlético scored a winning goal at the end of stoppage time to emerge as 4–3 winners after the sides traded leads in the second half.

[69] Forge traveled to Winnipeg with a chance to clinch the regular season title with a win against Valour on October 6.

[70] Noah Jensen scored in the 36th minute off of a cutback from Kyle Bekker in what proved to be the match's only goal, securing a trophy-clinching 1–0 road win.

[75] The Hammers returned to Hamilton to face Atlético Ottawa on October 12 in a match that didn't matter in the standings for Forge, but would be followed by a trophy ceremony.

[81] Khadim Kane and Amadou Koné both started the match to help Forge surpass the CPL-mandated 2,000 minimum minutes to be played by U-21 Canadian players.

[92] Malik Owolabi-Belewu scored with a header off a corner kick in the 53rd minute to give Forge a 1–0 win, qualifying the Hammers for a sixth consecutive CPL final.

As of April 11, 2024[update][121][122] In July, Hamilton-based steelmaker and Hamilton Sports Group minority owner Stelco was sold to American steel manufacturer Cleveland-Cliffs.

[128][129] On January 25, Forge announced a "School Day Match" as part of its CPL schedule to be played against HFX Wanderers FC on Tuesday, May 7 at 11:00 am when students in grades 6 to 12 would be able to attend.

[48] Forge unveiled its 2024 primary and alternate kits at a supporters event on March 28 hosted at Tim Hortons Field.

1 Matchday 4 (vs HFX Wanderers) was postponed to August 14 due to Forge's participation in the Canadian Championship quarterfinals.

[163] Forge announced the schedule of its quarterfinal matches against CF Montréal on May 2;[132] Canada Soccer confirmed this the next day.