大老山隧道（英文：Tate's Cairn Tunnel），简称大隧，是香港最长的行车隧道。全长达3.95公里，为一条双程双线分隔双管隧道。车速限制每小时70公里，，穿越吊草岩与牛坳山一带山脉，以邻近高峰大老山命名。大老山隧道是连接九龙与新界的主要5条隧道之一。
大老山隧道在一九九一年通车，为九龙与新界东北部提供另一条直接连接通道。
Cairn Tunnel was opened to traffic in 1991, providing an additional direct road link between the north-eastern New Territories and Kowloon.
大老山隧道在1991年通车，为九龙与新界东北部提供另一条直接连接通道。
The Tate's Cairn Tunnel was opened to traffic in 1991, providing an additional direct road link between the north-eastern New Territories and Kowloon.
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