The Sarıyer–Çayırbaşı Tunnel (Turkish: Sarıyer–Çayırbaşı Tüneli) is a twin-tube road tunnel under the northern suburbs of Istanbul, Turkey connecting Sarıyer district and Çayırbaşı neighborhood in the same district.
The tunnel is part of a project of the Istanbul Metropolitan Municipality to build seven tunnels for the "City of Seven Hills", which is the nickname of Istanbul.
Its south entry is situated in Hacıosman Bayırı at Çayırbaşı neighborhood while the northern entry is located in Kilyos Street in Sarıyer.
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