The Leinster Lateral (also known as the GGP to Leinster Power Station Lateral) is a transmission pipeline located in mid-west Western Australia. It is owned and operated by the APA Group.

The Leinster Lateral is 5 km in length. It transports gas from the Goldfields Gas Pipeline (GGP) to Leinster, where the gas is used for power generation.
 
The Leinster Lateral is currently a non-scheme pipeline, and is subject to the access regime for non-scheme pipelines under Chapter 6A of the NGL and Part 23 of the NGR. On 8 May 2023, the ERAWA granted a five year Category 2 and 3 exemption under Part 23 to the Leinster Lateral.

The pipeline was initially a covered pipeline under the Gas Code. However in July 1999, the relevant minister decided to revoke coverage of the Leinster Lateral and the associated Mt Keith Lateral after an application was made to the NCC. The NCC subsequently made a recommendation that coverage should be revoked.

The GGP and the Leinster Lateral are several pipeline assets across Australia which were partly owned by AGL and were transferred to the APA Group in 2000 as part of the APA Group’s initial public offering and listing.