Firm Profile > Acar & Ergönen Law Firm > Istanbul, Turkey

Acar & Ergönen Law Firm
Maslak Mah. Eski Buyukdere Cad. No:7
2000 Plaza Kat:17

Dispute resolution Tier 4

Acar & Ergönen Law Firm represents corporate clients in commercial disputes, with strong capabilities in real estate, construction, energy, and healthcare. The firm also assists high net-worth individuals individuals with estates and trust administration. The team is jointly led by Onur Ergönen, who focuses on corporate disputes, and registered mediator and commercial litigator Duygu Acar Yücesoy.

Practice head(s):

Onur Ergönen; Duygu Acar Yücesoy


‘First of all, the firm is always offering a very reliable and on time services. They are also very resourceful about finding the right way which leads you to right decision.’

‘Both of the partners of the firm are highly skilled about offering the different point of view which caused you to feel more comfortable about the consequences of the cases.’

‘Besides having vast knowledge in their field, the most important differentiator is that the AE team is solution oriented. They reach a conclusion and come with results while paying attention to important details.’

‘Onur Ergonen, is a great litigator and negotiator who knows what he is doing. He has provided very useful insight and different vantage points whilst dealing with trouble tenants who fail to fulfill their obligations under lease agreements. Instead of taking things slow, he tends to provide quick but also practical and well tailored solutions to our issues and this is what we need when we need to close deals with tenants in a short time frame. ’

‘We have been pleased with the service we received from this firm. We have worked with them on numerous occasions, they provide a thorough legal analysis, delve into the various aspects of the matter and deliver their response in a timely manner. The firm’s dispute resolution capabilities puts them in a unique position compared to other firms as this is at the heart of the practice of this firm.’

Key clients

Multi Corporation Turkey

Gefco Turkey

Affidea Health Group

Hanwha Q Cells Corporation

Hanwha Solar One Hong Kong

Lufthansa Technik



Keller Williams

Senvion Group

Grand Circle




Octet Express

Bebek Turizm

İpek İnşaat ve Çakırkaya Ortak Girişimi

Başar Başaran and Haşim Çağan Şentürk

Acar & Ergönen is a law firm providing domestic and international clients with creative and effective solutions tailored to each client’s needs by handling legal matters with a result-oriented approach and assessing all possibilities and risks in a broad perspective.

Our firm renders consultancy, litigation, arbitration and alternative dispute resolution services to its clients in a variety of legal areas including, primarily, corporate and commercial law, mergers and acquisitions, contract law, foreign direct investments, tax law, employment law, intellectual property law, construction and real estate law and health law.

Our team consists of attorneys experienced in both dispute resolution and consultancy areas who are, therefore, competent in making accurate and effective risk assessments in line with our firm’s overall approach.

Department Name Email Telephone
Duygu Acar Yücesoy +902123580700
Onur Ergönen +902123580700
Aslı Tezcan +902123580700
Photo Name Position Profile
 Duygu Acar Yücesoy  photo Duygu Acar Yücesoy Managing Partner
 Onur Ergönen  photo Onur Ergönen Partner
 Aslı Tezcan  photo Aslı Tezcan Partner
Partners : 3
Lawyers : 10
Other staff : 3
IBA (International Bar Association)
Corporate Governance Association of Turkey (TKYD)
AHK Deutsche Handelskammer

CLIENT: Ahu Hacıömeroğlu Ergin – Director, Legal and Compliance at Multi Turkey Yönetim A.Ş.
COMPANY/FIRM: Multi Turkey Yönetim A.Ş.
TESTIMONIAL: I have been working with Acar & Ergönen Law Firm for more than 2 years. I am admired of their way of working. First, they specialised in their field so that they can provide efficient and timely legal advice that fits into the business requirements. Second, they are very good at understanding the needs of the client and accordingly they provide tailor-made legal services with a pragmatic approach. Third but not the last, they are very professional, ethical and trustworthy. I strongly recommend them to everyone who seeks first-class legal service.

CLIENT: Haşim Çağan Şentürk
COMPANY/FIRM: Salbaze/Haşim Çağan Şentürk
TESTIMONIAL: I have had the pleasure of working with Onur Ergönen and Duygu Yücesoy, both partners of Acar&Ergönen, for the last four years on an international multi-faceted legal dispute my partner and I are involved in against big conglomerates in Europe.

For the duration of our working together, I have always been more than impressed with their professionalism and efficiency as much as the depth and breadth of their knowledge not only in Turkish law, but in German law as well.

They are always very direct, honest and informative in their approach. Through their extensive experience, they are quite impressive in recognising potential risks and pitfalls in legal proceedings. We are completely satisfied in all aspects of our collaboration.

CLIENT: Basar Basaran
COMPANY/FIRM: Salbaze/Basar Basaran
We have been working with Onur and Duygu for the past four years in highly complex and connected case
across three countries: Turkey, Germany and Luxembourg.

They form a powerful, hard-working litigation duo with laser-sharp focus. Their attention to detail is superb. Their legal know-how and continued desire to build it further are remarkable.

Their availability, resourcefulness and articulateness are also worth noting. Their strategic ability to think out-of-the-box, and perseverance in checking every angle of an argument have served our case well. Their theoretical grasp of law is strong; their presence in the courtroom is stronger.