The Australia Pacific LNG Gladstone Pipeline (also known as the APLNG Pipeline or the APLNG Mainline) is a transmission pipeline in central Queensland. The pipeline is owned by Australia Pacific LNG (APLNG), which is a joint venture between Origin Energy, ConocoPhillips and Sinopec. Origin Energy is the operator of the pipeline and also operates APLNG’s coal seam gas fields. 

The APLNG Pipeline is 530 km in length and 1066.8 mm in width, and has a daily capacity of 1560 TJ. 

The APLNG Pipeline transports gas from APLNG’s coal seam gas fields in the Bowen-Surat basins near Wandoan in central Queensland to APLNG’s LNG processing facility at Curtis Island near Gladstone. It connects to the Condabri and Woleebee Laterals, as well as to the QGC via the Combabula Spur. The Narrows Crossing portion of the APLNG Pipeline comprises of three sections totalling approximately 11 km and extends from the last mainline valve (ML4) on the main gas transmission line to Curtis Island.

In 2012, the Commonwealth Minister (being the relevant minister) granted a 15 year non-coverage determination for the APLNG Pipeline. The APLNG Gladstone Pipeline is currently a non-scheme pipeline, and is subject to the access regime for non-scheme pipelines under Chapters 4 and 5 of the NGL and Part 10 of the NGR. On 26 February 2018, the AER provided the APLNG Pipeline with a 12 year category 1 and category 2 exemption under the former Part 23 of the NGR under the name APLNG Mainline and Narrows Crossing. 

Construction of the APLNG Pipeline was completed in 2014.