Stephen Yagman (born December 19, 1944) is an American federal lawyer and advocate.
Among criminal defendants and litigants against police departments, he has a reputation as an effective counsel and advocate, particularly in cases regarding allegations of police brutality, and as a "pugnacious civil rights lawyer."In 2007, Yagman was convicted of criminal tax evasion, resulting in both his legal disbarment and in a three-year federal prison sentence.
Yagman contended, in his defense, that the IRS had selectively and vindictively prosecuted him, ignoring the difference between tax avoidance, which is legal, and tax evasion, which is not, because, as Idaho Special Prosecutor (1997–2001), he prosecuted homicide charges against FBI sniper Lon Horiuchi for allegedly murdering Vicki Weaver at Ruby Ridge, Idaho in 1992 and because on January 19, 2002 he brought the first Guantanamo Bay detainee case and won it on December 18, 2003.