The winger left the Stade Velodrome for St James' Park in the summer but has returned after a disappointing spell on Tyneside
The former France Under-21 international joined Newcastle from Marseille at the start of the season, but failed to make an impact at St James' Park and has now returned to the Ligue 1 side.
"Newcastle United winger Florian Thauvin has returned to Marseille on loan until the end of the season," read a statement on the official Newcastle website.
"The 23-year-old arrived on Tyneside from the French club last August, but has headed back to the Stade Velodrome for the remainder of the 2015-16 campaign.
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"Thauvin has made 16 appearances for Newcastle to date, five of which were starts, and has scored one goal."
The winger enjoyed a successful spell with OM between 2013 and 2015, scoring 13 goals in 67 Ligue 1 appearances.