Nakahara-ku (中原区) is one of the 7 wards of the city of Kawasaki in Kanagawa Prefecture, Japan. As of November 2014, the ward had an estimated population of 244,565 and a density of 16,637 persons per km². The total area was 14.70 km².

Nakahara Ward is located in eastern Kanagawa Prefecture, in the center portion of the city of Kawasaki, bordering on Tokyo to the north and Yokohama to the south.

• Saiwai-ku, Kawasaki
• Takatsu-ku, Kawasaki
• Setagaya-ku, Tokyo
• Ōta-ku, Tokyo
• Kōhoku-ku, Yokohama

Archaeologists have found numerous Kofun period remains at numerous locations in what is now Nakahara-ku, indicating a long period of human settlement. Under the Nara period Ritsuryō system, it became part of Tachibana District Musashi Province. In the Edo period, it was administered as tenryō territory controlled directly by the Tokugawa shogunate, but administered through various hatamoto. After the Meiji Restoration, the area was divided into Nakahawa Village and Sumiyoshi Village within Tachibana District in the new Kanagawa Prefecture on April 1, 1889. The two villages merged in 1925 to form the town of Nakahara. The town was annexed by the neighboring city of Kawasaki in August 1933. In April 1972, the area became Nakahara Ward with the division of the city of Kawasaki into wards.

Nakahara Ward is largely a regional commercial center and bedroom community for central Kawasaki and Tokyo. The Ward hosts Fujitsu's Main Branch at Kamikodanaka 4-chome in Nakahara-ku. It was formerly Fujitsu's world headquarters. Other industries include factories operated by Mitsubishi Fuso and NEC.

• JR East – Nambu Line
  • Musashi-Shinjō - Musashi-Nakahara - Musashi-Kosugi - Mukaigawara - Hirama
• JR East – Yokosuka Line
  • Musashi-Kosugi Station,
• Tokyu Corporation – Tōkyū Tōyoko Line / Tōkyū Meguro Line
  • Shin-Maruko - Musashi-Kosugi - Motosumiyoshi

The Tōkaidō Shinkansen passes through Nakahara-ku but does not stop.

• National Route 466 (No. 3 Keihin Road, as "Daisan-Keihin" (第三京浜))
• Kanagawa Prefectural Road 2
• Kanagawa Prefectural Road 14
• Kanagawa Prefectural Road 45
• Kanagawa Prefectural Road 111

• Todoroki Athletics Stadium

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• Nippon Medical School – Shin-Maruko Campus

Municipal junior high schools:

Municipal elementary schools:

• Nakahawa Ward Office