Pat Conacher was selected by the New York Rangers in the 4th round of the 1979 NHL Entry Draft, 76th overall. He had played two years of major junior hockey with the Billings Bighorns and the Saskatoon Blades. In 1978-79, he began the season with Billings, but was traded to Saskatoon with 33 games left in the season. Between the two teams, Conacher scored 40 goals and 69 assists for 109 points in 72 games.
As an NHL rookie in 1979-80, Conacher suited up for 17 games with the Rangers, collecting five assists. The balance of his season was played in the AHL with the New Haven Nighthawks. He played another five games with the Rangers in 1982-83, when his rights were obtained by the Edmonton Oilers in 1983-84. He played 45 games in his hometown, scoring two goals and ten points as the Oilers went on to win their first Stanley Cup championship that spring.
Conacher spent the next two years in the minors before playing 24 games with the New Jersey Devils in 1987-88. He responded with two goals and seven points while seeing limited ice time. Conacher remained in the Devils' organization until the 1992-93 season when he joined the Los Angeles Kings. In 81 games, he had nine goals and 17 points in a defensive, checking role. Conacher and the Kings advanced to the Stanley Cup finals, where they lost to the Montreal Canadiens in five games. Conacher contributed offensively with six goals and ten points in 24 post-season games. The following year he had a career-high 15 goals and 28 points.
Midway through the 1995-96 season, Conacher was dealt to the Calgary Flames where he played seven games before heading east to join the New York Islanders for the final 13 games of his NHL career. In 1997-98, Conacher appeared in 34 games for the Canadian National Team before calling it a career.
In an a career that spanned over 13 seasons and 521 NHL games, Conacher scored 63 goals and 139 points before heading behind the bench as an assitant coach with the Phoenix Coyotes in 2001-02.