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Duffy, Ryan

Ryan Duffy - Sioux Falls, SD

Attorney at Ryan Duffy Law

Criminal Law Lawyers in Sioux Falls, SD

524 N Main Ave Suite 110 Sioux Falls, SD 57104

  • Free Consultation

Sioux Falls Criminal Law Lawyer

Updated: 05/18/2026

Areas of Practice

  • Criminal Law 80%
  • Pardons 10%
  • Sentence Modifications 5%
  • Expungements 5%

Attorney Information

Overview

Ryan is a South Dakota native who was raised in Madison, South Dakota. Ryan holds Bachelor of Science degrees in both criminal justice and political science from the University of South Dakota and his Juris Doctorate from the University of South Dakota School of Law.

​​Ryan began his legal career in Sioux Falls practicing criminal law at the Minnehaha County Public Defender's Office for over four years. Ryan attained valuable courtroom and negotiation experience while defending cases from DWI/DUI to Grand Theft, Aggravated Assault, Drug Distribution, Burglary, Robbery, Homicide, and Rape.

In 2012, Ryan founded Ryan Duffy Law, where he focuses primarily on criminal defense and helping clients attain pardons and sentence modifications. Ryan understands that all types of people can be charged with a crime, and everyone deserves zealous representation. Ryan is dedicated to protecting the rights of his clients and ensuring a just resolution to their cases.

Ryan is licensed to practice law in South Dakota. He and his wife have 2 daughters and German Shepherd.


Education

  • Legal Education

    • University of South Dakota School of Law, Vermillion, South Dakota
      Juris Doctorate
  • Non Legal Education

    • University of South Dakota
      Major: Criminal Justice
      Major: Political Science

Languages

  • English

Bar Admissions

  • South Dakota

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