The Kia Opirus (known as Amanti in North America) is a full-size luxury car / executive car produced by Kia Motors of South Korea that was launched in April 2003. The Opirus/Amanti was Kia's first entry into the large-car market. It is sold in a single trim level and only as a sedan, and has an MSRP of US$26,875. It shares some components with its now-defunct corporate cousin, the Hyundai XG Grandeur, including its 3.5L V6 engine.

For 2007, the Kia Opirus received various upgrades, including suspension and styling revisions, and the addition of the same engine as the current Hyundai Grandeur (Azera), this time being a 3.8L V6 engine.

A diesel-powered alternative is not available.

Kia markets its Opirus to budget-conscious individuals who desire some premium features at a comparatively lesser price. As usual, Kia also attracts customers to its dealerships by offering a 10 year/100,000 mile powertrain warranty that has become synonymous with the major Korean car brands.

In the U.S., the Amanti was recently recognized as the "Most Appealing Premium Midsize Car" by J.D. Power and Associates' 2005 Automotive Performance, Execution and Layout Study.

The 2007 Amanti outscored several pricey luxury cars in IIHS side-impact crash testing, to earn the highest rating of Good.

The car is not commercialized in the United Kingdom, leaving the Kia Magentis as Kia's only executive car sold in that market.