[1] On the player front, Connacht entered the season with a new captain following the forced retirement of Craig Clarke due to persistent concussions.

The draw for the Challenge Cup pool stages took place on 10 June 2014, with Connacht named in the same group as Exeter Chiefs, Bayonne and La Rochelle.

[7] Connacht experienced their first defeat of the season in the next round, losing to Glasgow Warriors in their final game of the month.

[10] Connacht opened their 2014–15 Challenge Cup campaign at the Sportsgrounds on 18 October with a 48–12 bonus point victory over Top 14 side La Rochelle.

When they returned to action, Connacht picked up a comfortable bonus point victory over Zebre at home, posting a final score of 43–3.

[15] Connacht opened the month of December with a crucial double-header against Bayonne in the Challenge Cup, and won the first of these games comfortably, picking up a bonus point in a 42–19 victory to narrow the gap to Exeter Chiefs.

[21] The poor form was carried into Europe as Connacht lost another home match in quick succession, being beaten 24–33 by the Exeter Chiefs.

[22] The team was able to recover the following week to beat La Rochelle and secure a place in the knock-out stage of the competition.

[25] Connacht opened the month of March with bonus point victory over Benetton Treviso, crushing the Italians 53–5.

[26] On 6 March, Connacht faced Cardiff Blues away ahead of a tough series of matches against teams in the play-off places, making the game important in the qualification for the 2015–16 Rugby Champions Cup.

In the aftermath of the game, Pat Lam criticised touch judge Leighton Hodges and lodged a complaint with the league.

[32] Connacht were able to start the month with their first win since 1 March, beating Zebre 10–40 in Italy, to earn a try bonus and leave themselves with a chance of reaching the Champions Cup.

Connacht proceeded to a play-off involving Bordeaux Bègles, the 7th placed team in the 2014–15 Top 14 season, and Gloucester the 2014–15 Rugby Challenge Cup winners.

At the end of the 2014–15 Pro12 season, an Awards evening was held in the Guinness Storehouse in Dublin, with Connacht among those honoured both as a team and for individual performance.