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Me Marie-Soleil Tanguay

Lawyer

Me Marie-Soleil Tanguay joined the CSG Avocats team in 2024, bringing exceptional experience gained during her articling at a major criminal law firm in Montreal. A graduate of the University of Ottawa’s Faculty of Law (2023), she also completed a year of undergraduate studies in criminology. She was admitted to the Québec Bar and officially graduated in 2024.

Her path is marked by a constant commitment to justice and access to rights. Me Tanguay has gained extensive experience and in-depth knowledge of criminal law through several clinical trainings. She has worked with legal aid in criminal and youth matters, as well as at CSG Avocats and the Directeur des poursuites criminelles et pénales (DPCP). This background has allowed her to develop a comprehensive understanding of the various spheres of criminal law, enriching her practical expertise and strategic thinking. Having experience on both the defence and prosecution sides gives Me Tanguay a major advantage that sharpens her analysis and approach in criminal cases.

Today, Me Tanguay brings her diverse experience and passion for justice to serve her clients, combining rigor, empathy, and solid expertise in criminal and penal law.

Region of practice

Me Tanguay practices both in the Outaouais region and in Maniwaki.

Contact details

819-770-4888 ext. 110
EMERGENCY: 819-743-3747
mstanguay@csgavocats.com

Assistant

Chantal Lefebvre
819-770-4888 ext. 104
adjointe@csgavocats.com

Areas of expertise

Me Tanguay handles a wide range of criminal law cases, including sexual assault, domestic violence (assault, threats, harassment), impaired driving, theft, drug-related offenses, breaches of conditions, and criminal negligence. She also appears before the Youth Division, where she represents minors charged with various criminal offenses.

Regardless of the area of law, Me Tanguay provides rigorous and effective defense for her clients, supporting them through every step of their legal process, no matter the stakes. Me Marie-Soleil Tanguay also handles all types of offense-related matters, regardless of their nature. Her in-depth knowledge of the applicable laws allows her to develop effective strategies to challenge or mitigate the consequences of such offenses.

Involvements

  • Barreau de l’Outaouais
  • Criminal and Correctional Law Association of the University of Ottawa

Distinctions

Me Tanguay and her team were crowned Canadian champions at the prestigious Sopinka Moot, recognizing her legal skills and excellence in mastering her cases.

Recent successes

  • Release from custody

    In criminal cases where the client was arrested for harassment and failing to comply with a promise, Me Tanguay secured the client’s release despite multiple pending matters. A few days later, when the client was arrested again for harassment, death threats, and failing to comply, Me Tanguay once again, after tough negotiations with the Crown prosecutor, succeeded in obtaining her client’s release while awaiting trial.

  • “Car Surfing”

    In a penal case where the client was charged with “car surfing” and risked losing 12 demerit points and paying a $1,500 fine, the arguments advanced by Me Tanguay led to a settlement in which the client lost no demerit points and only had to pay a $120 fine. This outcome saved the client’s driver’s license.

  • Sentencing

    In a criminal case where the client sought to negotiate a sentence, Me Tanguay managed to secure an even more lenient sentence than expected. Thanks to her advocacy, the client avoided harsher consequences.

Contact us today

The sooner you act, the greater your chances of securing a strong and well-prepared defense. Our team is here to listen to you, guide you, and protect your rights at every stage of the legal process, with rigor, humanity, and dedication.
819-770-4888
reception@csgavocats.com
Monday to Friday – 8:00 am to 4:30 pm
166 Wellington Street, Gatineau, QC J8X 2J4
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