Walther von Klingen (died 1 March 1284) was a nobleman from the Thurgau area who donated to and founded monasteries, and later became a close associate and supporter of King of Germany Rudolf von Habsburg. Some of his poetry, which belongs to the Middle High German German: [[Minnesang]] tradition, has been preserved in the Codex Manesse manuscript.
Walther came from an old Thurgau family. He was the son of Ulrich II von Altenklingen, the founder of Klingnau. His mother was Ita von Tägerfelden. The first document mentioning Walther (together with his parents and older brother) is from 1240. In 1249, he married Sophia von Frohburg. They had eight children, but all of their three sons died early. After his father's death, the family estate was split between Walther and his brother, which was finalised in a 1253 contract. Walther also gained ownership of some of his mother's inheritance. He donated generously and founded the Klingenthal monastery in Basel in 1257 as well as the in Klingnau in 1269. He appears in several documents as arbitrator of disputes or witness of important contracts. Walther was a close associate and supporter of King Rudolf von Habsburg. He owned houses and lived in Strassburg and in Basel. He died on 1 March 1284 in Basel.
Eight of Walther's songs were preserved in the Codex Manesse manuscript. In the corresponding miniature, Walther is shown as the victor of a joust, bearing the Altenklingen coat of arms. His poetry has been described as "not worthy of special praise" and he is considered only a "minor" poet. The known poems are conventional songs with themes of lamentations, courtship or praise, and show influences of Gottfried von Neifen and Konrad von Würzburg. All of them date from Walther's time in Klingnau, before 1271.