The Mount Magnet Lateral Pipeline is a transmission pipeline located in mid-west Western Australia. It is a lateral pipeline of the Mid West Pipeline and was commissioned in 1999.

The Mount Magnet Lateral Pipeline is owned by an unincorporated joint venture - the Mid West Pipeline Joint Venture. The joint venture parties are Horizon Power and Mid-West Pipeline Pty Ltd. Both parties have a 50 per cent interest in the pipeline. The Pipeline was previously operated by the APA Group, which had a 50 per cent interest in the pipeline. The other 50 per cent interest was held by Horizon Power.

The Mount Magnet Lateral Pipeline is 11 km in length, and has a width of 203/178 mm, and a capacity of 4.1 TJ/day. The Mid West Pipeline and Mount Magnet Lateral transport gas from Dampier to Bunbury Natural Gas Pipeline (DBNGP) near Geraldton for supply to Mount Magnet.

The Mount Magnet Lateral Pipeline 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 20 June 2023, the ERAWA granted a five year Category 3 exemption under Part 23 to the Mount Magnet Lateral Pipeline.