Ethier, who led the league with 12 RBIs last week, went 9-for-23, tied for the league lead with four homers and eight runs scored, ranked second with 23 total bases and third with a 1.000 slugging percentage as the Dodgers went 6-0 on their first homestand of the year.
Most of Ethier's success has come batting directly behind Manny Ramirez.
"You know you'll get pitches to hit and when he's hot pitchers come after you, they don't want to put you on base and give him opportunities to drive in runs," Ethier said this week.
"The key for me, there's a fine line figuring out how they'll approach me this year. Sometimes you find yourself watching instead of being aggressive. After the first few games, I said it was time to get after it."
Other nominees included Ethier's teammates Orlando Hudson, Chad Billingsley and Matt Kemp.
Ethier shared NL Player of the Week honors with Houston's Roy Oswalt last Sept. 1-7 when he went 13-for-20 with three homers and eight RBIs.
Ethier will receive an engraved Swiss watch from Torneau.
Ethier and the Dodgers traveled to Houston on Monday and resume play Tuesday night against the Astros.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.