2017–18 WOAA Senior League season

The 2017–18 WOAA Senior League season was the 28th season of the WOAA Senior AA Hockey League. The league played a 20-game regular season which began in October 2017 and concluded in January 2018. The post-season began in February 2018 and concluded in March 2018.

The Clinton Radars won the WOAA Senior AA Hockey Championship, defeating the Durham Thundercats in the final round of the playoffs.

Team changes

 * The Mapleton-Minto 81's took a leave of absence for the 2017–18 season.

Petrolia Squires unsigned player
On January 19, 2018, the Petrolia Squires were penalized by the Western Ontario Athletic Association, for allegedly using an unsigned player. The WOAA has stripped the Squires of victories over Huron East, Lucknow and Milverton, and the loss of six points in the standings eliminates Petrolia from the Senior AA playoffs. Squires’ President Dave Connors tweeted Friday that the veteran player's card was missed when the cards were signed, scanned and e-mailed to the WOAA office prior to the start of the season.

Final standings
Note: GP = Games played; W = Wins; L= Losses; OTL = Overtime losses; GF = Goals for; GA = Goals against; Pts = Points; Green shade = Clinched playoff spot

Scoring leaders
Note: GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalty minutes

WOAA Senior "AA" Hockey playoffs
The top eight teams qualify for the WOAA Senior "AA" Hockey playoffs. Each series is a best-of-seven.

WOAA Senior "A" Hockey playoffs
The bottom five teams qualified for the WOAA Senior "A" Hockey playoffs.