Phillips Petroleum Co. v. Shutts, 472 U.S. 797 (1985), was a conflict of laws case decided by the United States Supreme Court.

[1] Phillips Petroleum Company was sued in a class action lawsuit in Kansas for overdue interest payments.

Phillips asserted that adverse decisions of Kansas court may bind absent plaintiffs by res judicata.

The first was whether the use of Kansas law for all plaintiffs violated Fourteenth Amendment Due Process, or the Full Faith and Credit clause.

The Supreme Court held that the defendant's desire is irrelevant, otherwise forum shopping would rule.