The Eastern Line is the name of the suburban rail service in Auckland, New Zealand between Britomart and Manukau via the North Island Main Trunk (NIMT) and Manukau Branch. Services are operated by Auckland One Rail under the Auckland Transport brand.
In December 2014, all Eastern Line train services began terminating at Manukau, rather than alternating between Manukau and Papakura. Electrification of the Auckland suburban network was completed in July 2015, and all passenger services on this line are electrified.
On 20 March 2023, Orakei, Meadowbank, Glen Innes, Panmure and Sylvia Park stations were closed due to Stage 2 of the Rail Network Rebuild, with buses replacing trains on this line between Ōtāhuhu and Britomart. The line reopened on 15 January 2024.
The Eastern and Western Lines will be merged into the East-West Line once the City Rail Link project is finished.