The Baggies inflicted a fifth-straight away defeat on the Râ€™s to go 13 points clear of the drop zone whilst the West Londoners remain in the relegation mire as they are only two points clear of 18th-placed Bolton who have two games in hand.
Graham Dorransâ€™ 22nd minute goal was the difference in the end but it could have been a different story if QPR had have taken their chances throughout.
Bobby Zamora was denied early by an advancing Ben Foster and could arguably have had a first-half hat-trick but it was Dorrans who came up with the goods with a long range thunderbolt which gave Paddy Kenny no chance.
Zamoraâ€™s 39th minute header was inches wide before Foster came up with a brilliant save to deny the former Fulham man who was picked out by Taye Taiwoâ€™s long ball from his own half.
Billy Jones was denied his first goal for the Baggies when he hit the post in the 56th minute but in the end it was the solitary first-half goal which gave the home side the points with QPR living to fight another day.
The Hawthorns, West Bromwich â€“ 25,521