| Bridge Name: | Donghai Bridge |
| Native Name: | 东海大桥 |
| Native Name Lang: | zh |
| Image Upright: | 1.4 |
| Other Name: | East Sea Big Bridge |
| Locale: | Shanghai and Yangshan Port |
| Design: | Beam bridge with cable-stayed section |
| Coordinates: | 30.7572°N 179.13°W |
Donghai Bridge (Chinese: t Chinese: {{linktext|東海|大橋, s Chinese: {{linktext|东海|大桥, p Dōnghǎi Dàqiáo, Wu Tonhe Dujiau "East Sea Bridge") is a Chinese bridge counted among the longest cross-sea bridges in the world. It was completed on December 10, 2005. It has a total length of 32.5km (20.2miles) and connects mainland Shanghai's Pudong New Area with the offshore Yangshan Deep-Water Port in Zhejiang's Shengsi County. Most of the bridge is a low-level viaduct. There are also cable-stayed sections to allow for the passage of large ships, the largest with a span of . Donghai Bridge is part of the S2 Hulu Expressway.
The bridge has a long and narrow speedway and does not allow vehicles that do not meet the weight requirements.
On 29 January 2014, Shanghai's urban planning authorities announced that they would build a second bridge combining road and rail to help meet growing transport demands for the Yangshan Deep-Water Port.[1] Plans from 2019 show that this second bridge is proposed to connect Shanghai to Ningbo via Yangshan port.[2]