2009-10: Shane Prince began his second OHL season with Kitchener before going to the Ottawa 67's in a mid-season trade. Prince scored 8 goals with 9 assists in 39 games for the Rangers in a lineup that included star prospects like Jeff Skinner and Gabriel Landeskog. In 26 games with the Ottawa 67's he scored 7 goals with 6 assists and was plus-five with 13 penalty minutes. Ottawa finished first in the East Division and reached the second round in the playoffs. Prince skated in all 12 playoff games and was plus-four with 2 goals and 2 assists.
2010-11: Prince had a breakout season for the Ottawa 67's in his third year in the OHL. Prince was the team's second leading scorer behind Kings prospect Tyler Toffoli despite missing nine games late in the season due to a concussion. He scored 25 goals with a team-leading 63 assists in 59 games and was plus-43 with 18 penalty minutes. Ottawa finished first in the East Division but was swept by Sudbury in a high-scoring first round playoff series. Prince missed the first game of the series while still recovering and in three playoff games was minus-six with 1 assist. Ranked 35th amongst North American skaters in Central Scouting's final rankings, he was selected by the Senators in the 2nd round (61st overall) of the 2011 NHL Draft.
2011-12: Prince attended the USA U20 Evaluation Camp in Lake Placid in August before heading to Senators' camp. He returned to the Ottawa 67s where he and Toffoli once again put on an offensive display. After suffering an early season shoulder injury, which may or may not have been the reason he was left off the USA roster for the 2012 World Junior Championship, he returned to scored 43 goals with 47 assists in 57 OHL games and was plus-34 with 12 penalty minutes. The 67's won the East Division for the third straight season and reached the playoff semifinals. Prince scored 7 goals with 9 assists in 18 playoff games and was minus-one with 6 penalty minutes. He signed a three-year entry-level contract with Ottawa in July, 2012.
2012-13: Prince skated for Ottawa's AHL affiliate in Binghamton in his first pro season. He was second on the team with 18 goals, one behind team leader Derek Grant, and had 17 assists in 65 games, finishing +12 with 24 penalty minutes. The Senators were second in the East Division and had the AHL's fourth-best record before being swept by Wilkes-Barre/Scranton in a first round series. Prince scored 1 goal and was +1 in three playoff games.