Arnold Hermann Ludwig Heeren (25 October 1760, Arbergen – 6 March 1842, Göttingen) was a German historian. He was a member of the Göttingen school of history.

Heeren was born on 25 October 1760 in Arbergen near Bremen, a small village in which his father was a clergyman. He spent the first 15 years of his life in Arbergen, where he was privately educated. From the beginning of the year 1776, shortly after his father had been appointed Prediger at the cathedral at Bremen, he attended the cathedral school there. At Michelmas 1779 he went on to the university at Göttingen, in accord with his father's wish that he work toward a degree in theology.

Having begun his studies at Göttingen, Heeren, like so many ambitious young men of that period, decided against theology as a vocation. (This did not, however, denote a turning away from religion; Heeren would remain sympathetic to religious belief throughout his life.) By Christian Gottlob Heyne he was introduced to philology, and by Ludwig Timotheus Spittler to the study of history. After much vacillation, Heeren let himself be persuaded by Spittler that his primary talent lay in historical research. It was the decisive moment of his young life.

With Heyne's blessing, Heeren decided to pursue an academic career. In 1784, having received his degree as a Doctor of Philosophy, he simultaneously earned the right to teach at Göttingen as a Privatdocent or adjunct professor. Though he recognized almost immediately that his true vocation lay elsewhere, his first scholarly work was in philology. In 1785 he published an edition of De encomiis by the rhetorician Menander, and proposed as well a critical edition of the Eclogae physicae et ethicae of Johannes Stobaeus. In connection with this work, as well as in hopes of improving his health, he then undertook (in July 1785) a trip to Italy, Paris, and the Netherlands. He spent seven months in Rome. Having a congenial personality, he immediately made himself at home there. Before departing he, the son of a Reformed clergyman, would earn the patronage of several Cardinals of the Catholic Church. He then passed two months in Paris.

After nearly two years he returned to Göttingen. With the sponsorship of Heyne, whose influence in Hannover was then at its height, and whose son-in-law he would later (1796) become, he was in June 1787 named to the faculty of the university itself as an außerordentlicher Professor of Philosophy. At Göttingen, such established scholars as Johann Christoph Gatterer, August Ludwig von Schlözer and Spittler were still active as historians. Now making his first appearance as a public lecturer, Heeren was careful to confine his teaching to a middle ground between History and Philology, partly out of diffidence and partly of a congenital indecisiveness. He thus avoided for some years a direct commitment to the discipline in which he would later become famous. During this period Heeren undertook with his friend Thomas Christian Tychsen a “Library of Ancient Literature and Art,” which had a short-lived existence. At the same time he initiated publication of the edition of Johannes Stobaeus's Eclogues that he had prepared years earlier. The first part appeared at Easter in 1792. The edition would reach its conclusion with the fourth part some nine years later. The reception given the first part was by not encouraging; the work of Thomas Gaisford and Augustus Meineke would eventually supplant the completed edition.

Seeing that his true gift was not for philological work, Heeren only now moved decisively toward historical scholarship as his chosen field. External circumstances also played a role. In 1794 he was named ordentlicher Professor of Philosophy, although still without a specific area of specialization. But at this point Gatterer and Schlözer had begun visibly to age. Spittler would leave Göttingen entirely in 1797. Gradually, therefore, place was made for Heeren as a historian, despite the fact that, at this point, he could scarcely claim to stand on an equal footing with such established senior scholars. He officially assumed the title of professor of history in 1801.

Heeren had given lectures on ancient history as early a 1790. His new circumstances soon brought out his talent as a historian of classical antiquity, in which he would achieve both intellectual fulfillment and great scholarly eminence. From his earlier lectures grew his magisterial Politics, Trade, and Commerce in the Ancient World, which would go through numerous later editions, with Heeren providing fundamental revisions as it continued to appear. With the appearance of the first edition, Heeren awoke to find himself famous. Even today, when Heeren has become a minor figure in the story of nineteenth-century German scholarship, his name continues to be associated with this work.

Part of its success was due to Heeren's fortunate choice of subject. Trade and commerce, hitherto neglected by historians, was now not only being pursued but, in Heeren's work, made the subject of thorough research. With good reason, it has been supposed that Heeren's Bremen background and his childhood memories of that thriving commercial city were responsible for his taking this particular direction. But to explain the overwhelmingly favorable reception that greeted Politics, Trade, and Commerce in the Ancient World, one must also take into account Heeren's considerable talent as a writer, as well as an acute historical sense and a sharply critical spirit without which a work on such a subject could not have failed to be dull reading.