Hattert (German pronunciation: [ˈhatɐt] ⓘ) is an Ortsgemeinde – a community belonging to a Verbandsgemeinde – in the Westerwaldkreis in Rhineland-Palatinate, Germany.

The community's first documentary mention has been dated to 13 December 1373 (the original document is found in the Hessian Hauptstaatsarchiv in Wiesbaden under the Akten-Nummer 74/484).

Sometime before 1402 arose the lesser noble name Nail von Hattenrode (also Nayl or Nayll), to whose estate the mill in the Hatterter Grund belonged as of 1427.

The family's last representative, Wilhelm von Hattenrode, died about 1523, whereafter the Hatteroth (later Sophiental) Estate underwent changing ownership arrangements.

In 1866, the Duchy of Nassau was annexed by Prussia in the wake of the Austro-Prussian War, soon after which – indeed the next year – the communities in the Hatterter Grund were assigned to the Oberwesterwaldkreis (district), whose seat was in Marienberg.

In 1969, the villages of Niederhattert with Laad, Mittelhattert with Hütte and Oberhattert were then amalgamated with each other to create what has been ever since then the biggest community in the Verbandsgemeinde of Hachenburg.

On 1 April 1885, the Altenkirchen-Hachenburg stretch of railway, the Oberwesterwaldbahn, was opened with a station at Hattert, whose building time can nevertheless no longer be exactly dated.

The school in Oberhattert was, after comprehensive repairs already held to have become unfit for use in 1887, but new building or a conversion could not be done owing to a lack of money and differences of opinion among those responsible.

Since then, schoolchildren have been going to the primary school in Müschenbach, while secondary-level students have been going to the Hauptschule and Realschule in Hachenburg as well as to the private Gymnasium run by the Marienstatt Abbey.