The Sharon plain (Hebrew: הַשָּׁרוֹן, romanized: HaSharon; Arabic: سهل الشارون, romanized: Sahl al-Shārūn) is the central section of the Israeli coastal plain. The plain lies between the Mediterranean Sea to the west and the Samarian Hills, 15 km (9.3 mi) to the east. It stretches from Nahal Taninim, a stream marking the southern end of Mount Carmel in the north, to the Yarkon River in the south, at the northern limit of Tel Aviv, over a total of about 90 km (56 mi). The level of the Sharon plain is connected to the level of the Mediterranean Sea by the Sharon Escarpment.

Parts of the plain are included in the Central, Haifa and Tel Aviv Districts of Israel.

The Sharon valley is mentioned in an ancient Egyptian stele of Amenhotep II, and as the Sharon field containing both Jaffa and Dor on the Sarcophagus of Eshmunazar II.

The Plain of Sharon is mentioned in the Bible (1 Chronicles 5:16, 27:29; Book of Isaiah 33:9, 35:2, 65:10), including the famous reference to the enigmatic "Rose of Sharon" (Song of Songs 2:1).

Excavations were performed before road construction in the north part of Sharon plain. Near En Esur, an early Bronze Age planned metropolis, including a temple, stretching over 65 ha for 6,000 inhabitants, was discovered. Under the 5000-year-old city, an even older settlement from 7000 YBP has been found, according to a report from the antiquities office of Israel on 6 October 2019.

Before the 20th century, the region was covered by the Forest of Sharon, an open woodland dominated by Mount Tabor Oak (Quercus ithaburensis), which extended from Kfar Yona in the north to Ra’ananna in the south. The area was called al-Ghāba in Arabic, “The forest, e.g. the great Oak forest of Sharon”. The local Arab inhabitants traditionally used the area for pasture, firewood and intermittent cultivation. The intensification of settlement and agriculture in the coastal plain during the 19th century led to deforestation and subsequent environmental degradation known from Hebrew sources.

Prior to 1948, the region was subordinate to Jaffa Subdistrict and Tulkarm Subdistrict.

Historically, while some parts of the Sharon plain were very fertile, much of it was swampy and malarial, a condition exacerbated by massive Ottoman deforestation. Zionist immigrants arrived in the early 20th century and populated the region with many settlements.

By 1945, Jaffa Subdistrict had a population of 373,800, consisting of 71% Jewish residents and 29% Palestinian Muslim and Christian residents. Tulkarm Subdistrict had a population 86,120, consisting of 17% Jewish residents and 83% Palestinian Muslim and Christian residents. During the 1948 Arab–Israeli War, the Arab population of the region left or was expelled almost entirely.

In 2008, it was the most densely populated region of Israel.

• Sarona, a Templar settlement in the Plain of Sharon

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