* TSX ends up 0.3% at 20,278.94

* Dollarama lifts consumer discretionary index

* North West Company Inc climbs 14.7%

* Energy falls 0.7%; oil settles 0.4% lower

Sept 13 (Reuters) - Canada's main stock index rose on Wednesday for a third straight day, led by gains for consumer-related stocks and as U.S. inflation data supported bets that the Federal Reserve would pause its interest rate hikes this month.

The Toronto Stock Exchange's S&P/TSX composite index ended up 55.86 points, or 0.3%, at 20,278.94, adding to its gains on Monday and Tuesday.

Stocks on Wall Street ended mixed as data showing a moderate increase in consumer prices in August cemented expectations that the Fed would move to the sidelines.

The Toronto market's consumer staples sector rose 1.2% and consumer discretionary was up 0.6%. It was helped by a gain of 5.9% for Dollarama after the discount retailer beat quarterly sales estimates.

Food and general products retailer, North West Company Inc posted strong second-quarter results. Its shares rose 14.7%.

Heavily-weighted financials also gained ground, rising 0.7%. But energy gave back some recent gains, ending down 0.8%, as oil settled 0.4% lower at $88.52 a barrel. (Reporting by Fergal Smith in Toronto and Khushi Singh in Bengaluru, Editing by Tasim Zahid)