ISTANBUL, Dec 13 (Reuters) - Turkey's competition

authority has fined Alphabet Inc's ( GOOG ) Google 2.61 billion lira ($75

million), for taking advantage of its dominant position in ad

server services market, the regulator said in a statement on

Friday.

The antitrust body said Google has favored its own

supply-side platform (SSP) service over rivals and that move

made its competitors' operations difficult.

Google must ensure within six months that competitors are

not disadvantaged and provide third-party SSPs similar

conditions that are applied to its own services, the regulator

added.

($1 = 34.9456 liras)

(Reporting by Ezgi Erkoyun

Editing by Ece Toksabay)