Kevin Leese Mannix (born November 26, 1949) is an American politician, business attorney, and former chairman of the Republican Party in the U.S. state of Oregon.

Of the seven referral measures four were passed by voters, which granted crime victims the right to be present during trial, to be consulted regarding plea bargains and to be heard at sentencing; limited the pre-trial release of violent criminals by authorizing courts to consider the safety of victims and the public; required that any term of imprisonment imposed by a court to be fully served, with the exception of the governor's clemency power; and prohibited felons from serving on grand juries and criminal trial juries.

This measure provided a mandatory minimum prison sentence of 25 years for repeat convictions of the worst sex crimes and required a minimum sentence of 90 days in jail, with costs reimbursed to the county by the state, for persons with a third DUII conviction within 10 years.

[citation needed] In 2012, Measure 84, an effort to repeal Oregon's estate tax, was also supported by Mannix but was defeated.

In 2000, Mannix ran as a Republican for State Attorney General, winning the GOP nomination and facing Myers in a bitter campaign.

[6] In the Republican primary, he defeated former Labor Commissioner Jack Roberts and Portland attorney and school board chair Ron Saxton.

Libertarian candidate Tom Cox received 5% – a margin which many observe could have swung the election, had those votes gone to Mannix.

The defeat also marked the fifth time in a row the Republicans failed to gain control of the governor's mansion.

He finished second in the primary with 30% of the vote, behind Saxton, who won the nomination with 43%, and ahead of state senator Jason Atkinson, who received 22%.

[7] Saxton, widely considered more moderate than Mannix,[8] went on to lose the general election in May to incumbent Kulongoski by an 8.1% margin.

[16] Mannix is also a board member, and vice president, of the Johann Strauss Society of America Foundation.

Mannix's main financial donor in his political career is Loren Parks, a businessman who is currently a resident of Nevada.