VIENNA (Reuters) - Hutchison Whampoa Ltd has completed its 1.3 billion euro ($1.7 billion) acquisition of Orange Austria to make it Austria's third-biggest mobile operator, it said on Thursday.

Its purchase from Mid Europa Partners and France Telecom-Orange followed extensive negotiations that finally won European Union and Austrian regulatory approval last month.

($1 = 0.7553 euro)

(Reporting by Michael Shields; Editing by Dan Lalor)