Second-half goals from Kader Hancar and Esra Manya was enough to see Turkey secure the three points and inflict a second defeat in three games for Ireland in Group 4.
Turkey started the game the better side but they were restricted to having shots from distance with Ece Turkoglu missing the target from range on five occasions during the opening half.
Ireland twice went close to breaking the deadlock before the half-time interval through Saoirse Noonan but after firing a shot straight at the keeper from the edge of the box, the Cork City WFC striker also had a header denied by Gamze Yaman.
Turkey finally took the lead at the beginning of the second period when Hancar headed Nursen Yaprak’s superb cross past Erica Turner at the back post.
And as Ireland pressed for an equaliser, with Noonan and Lucia Lobato both going close to snatching it, Turkey sealed the victory on the break late on when Manya found the far bottom left corner of the net from the edge of the box
Head Coach Dave Connell said: "We started off well against Austria, a great performance against Spain even though we lost the game and we started off brightly against Turkey, but we just didn't convert any of the chances we created. It's a disappointing result and a disappointing end for a lot of the players.
"There are 11 players in this group who qualify for us again, so we will try and get them in as soon as we can, along with some of the Under 17s that are gone over age for that group.
"We have two friendly games organised against Austria later in the year ahead of the First Round qualifiers in Lithuania in October, so we'll prepare for those. It's been a disappointing end to this campaign, but we'll start preparing for the next one."
Republic of Ireland: Erica Turner, Lynn Craven, Niamh Farrelly, Sadhbh Doyle, Alex Kavanagh, Saoirse Noonan, Megan Mackey, Phoebe Warner (Alannah McEvoy 45), Lucia Lobato (Aoife Thompson 78), Naima Chemaou, Orla Casey (Sinead Donovan 45).
Turkey: Gamze Yaman, Ayse Sevval Ay (Rabia Civan 75), Cansu Nur Kaya, Kader Hancar (Busra Becerikli 82), Esra Manya, Ece Turkoglu, Nursen Yaprak, Irem Yildirim, Derya Arhan, Sumeyra Kivanc, Sedanur Incik.
Referee: Lucie Sulcova.