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Valdemar IV Eriksøn (born c. 1262, died 1312) was Duke of Schleswig from 1283 until his death in 1312. He was the eldest son of Duke Eric I of Schleswig and Margaret of Rugia.
At the death of his father Duke Eric I in 1272, Valdemar was only about 10 years old. For the following ten years, King Eric V of Denmark, feudal overlord over the Duchy of Schleswig, refused to install Valdemar in his father's duchy. Only in 1283, at a meeting of the Danehof in the city of Vordingborg, did the Danish magnates force King Eric to install Valdemar as duke. In 1284 he granted city rights to the city of Flensburg.
However, Valdemar was not content and also claimed the island of Als, as well as the Crown lands of Schleswig. When in 1284 a judgment of the Danehof ruled against the claims of Duke Valdemar, he occupied the island of Als by force. However, the military campaign proved disadvantageous for the duke, and as he intended to travel north to gain support in Sweden and Norway, he was captured by King Eric and confined at Søborg Castle in 1285. He was released the following year on condition that he abandoned almost all of his claims.
Just half a year later, in November 1286, King Eric was assassinated, and Duke Valdemar naturally fell under suspicion. The Queen Dowager, Agnes of Brandenburg, apparently shared the suspicion, but feared open aggression with the Duke. Instead, his support was achieved by accepting his claims and appointing him regent of the kingdom during the minority of King Eric's under age son and successor, Eric VI.
Already in 1289, the confidence between Duke Valdemar and Dowager Queen Agnes was breached and a clash occurred between the Duke and the followers of the Queen. Shortly after, Duke Valdemar even entered into a league with King Eric II of Norway, then at war with Denmark. Apparently, in 1295 Valdemar suffered a defeat at a naval battle in the channel of Grønsund. In 1297, a final settlement was concluded where Duke Valdemar among other things abandoned his claims to the disputed island of Als.
その後数年間、エリック6世との些細な争いは続いた。しかしながら、概して公爵は国王と友好的な関係を保ち、スウェーデンや神聖ローマ帝国での戦争において国王を支援した。1311年には、エリック国王がロストックで開催した盛大な馬上槍試合に参加した。
ヴァルデマール公は1312年の春に死去した。公爵位は、すでに数年間父の共同統治者を務めていた息子のエリック2世が継承した。ヴァルデマールはシュレースヴィヒ大聖堂に埋葬された。
1287年、ヴァルデマール公はザクセン＝ラウエンブルク公ヨハン1世の娘、エリザベートと結婚した。この結婚により、ヴァルデマール公の唯一の嫡出子が生まれた。