Kuthiran Tunnel (Malayalam: കുതിരാന്‍ തുരങ്കം) is a twin-tube six-lane highway tunnel in the South Indian state of Kerala. The tunnel is located on the National Highway 544 and it is owned and operated by the National Highways Authority of India. This is Kerala's first-ever tunnel for road transport and South India's longest six-lane road tunnel. Construction of the tunnel started in 2016 and completed by December 2021.