The following season, he helped the Crew to the play-offs by finishing second in the Eastern Conference, and finished the 2015 MLS season as the joint top-scorer of the league, alongside Toronto FC's Sebastian Giovinco, with 22 goals in 33 games, although Giovinco claimed the MLS Golden Boot due to having provided more assists throughout the season (16 compared to Kamara's 8), which was the tie-breaking criterion. In November 2015, he was named one of the three finalists for both the 2015 MLS Landon Donovan MVP Award and the 2015 Advocare MLS WORKS Humanitarian of the Year Award; he was awarded the MLS Humanitarian of the Year Award on 5 November, although he missed out on the MVP Award, which went to Giovinco. On 8 November, he scored two goals in a 3–1 win over Montreal Impact in the Eastern Conference semi-finals of the MLS Playoffs, including the decisive goal in extra-time, which allowed Columbus Crew to advance to the Eastern Conference finals. On 22 November, he scored in the first leg of the 2015 MLS Playoff Eastern Conference Finals, a 2–0 win over the New York Red Bulls, which allowed Columbus to claim the 2015 Eastern Conference Championship 2–1 on aggregate and advance to the MLS Cup Final. Due to an injury sustained in training, however, it was initially uncertain whether Kamara would be able to feature in the 2015 MLS Cup Final against the Portland Timbers; nevertheless, he played all 90 minutes of the match, scoring the only goal for Columbus in a 2–1 defeat. With 4 goals, Kamara was the top-goalscorer in the 2015 MLS Playoffs, bringing his total seasonal tally to 26 goals although he missed out on the MLS Cup MVP Award, which went to Portland's Diego Valeri.