It was named the best firm with more than 40 fee earners and the best property firm.
The firm, which has its Scottish offices in Glasgow, Dundee, Edinburgh, Aberdeen and North Ber-wick, also shared a joint award in the employment category with Fox and Partners.
Judges said: "Simpson & Mar-wick demonstrated significant growth and development. They also provided fantastic testimonials which gave them the edge."
Allan McDougall, which has offices in Edinburgh, Dalkeith and Penicuik, was named the best law firm with fewer than 40 fee earners.
Judges said: "Allan McDougall's was an impressive entry which highlighted their charity work and ticked all of the criteria that the judges were looking for."
The firm also took away the high street firm title at last night's awards at Glasgow's Radisson Blu Hotel.
Harper Macleod's Rod Mackenzie was named solicitor of the year while Brian Inkster, from Inksters, got the managing partner award.
The judging panel was chaired by Hector MacQueen of the Scottish Law Commission. The Herald is the Law Awards of Scotland's media partner. The event was sponsored by Professional Office Supplies, Stirling Park, Tilney Bestinvest, The Firm and Investec Wealth & Investment.
The winners were: Lifetime Achievement Award: Gerald Gordon; Legal Personality of the Year: Patrick McGuire; Judges Choice Award: Brodies; Chairman's Award: Paula McCombie of Patience & Buchan; Law Firm of the Year (Under 40 fee earners): Allan McDougall Solicitors.
Law Firm of the Year (Over 40 fee earners): Simpson & Marwick; Global Law Firm of the Year: DLA Piper Scotland; High Street Firm of the Year: Allan McDougall Solicitors; Sole Practitioner of the Year: Bonaccord Ecosse; Solicitor of the Year: Rod McKenzie, Harper Macleod.
Managing Partner/ Team of the Year: Brian Inkster, Inksters; Paralegal of the Year: Kelie Coo-per, MacPhee & Partners; Up and Coming Lawyer of the Year: Dominic Dunnett, MBM Commercial; Trainee of the Year: Claire MacAlpin, MacPhee & Partners.
Criminal Law Firm of the Year: Aamer Anwar & Co; Family Law Firm of the Year: Thorley Ste-phenson; Up and Coming Law Firm of the Year: Kerr Brown Partnership; Employment Firm of the Year: shared by Fox and Partners and Simpson & Marwick; Property Firm of the Year: Simpson & Marwick; Litigation Firm of the Year: Thompsons; CSR Firm of the Year: DLA Piper Scotland; Debt Recovery Firm of the Year: TCH Law.
Faculty of the Year: Kilmarnock Faculty of Solicitors; In- House Legal Team of the Year: Glasgow 2014; Energy Firm of the Year: Davidson Chalmers.