The Long March 12 (Chinese: 长征十二号运载火箭), or Chang Zheng 12 as in pinyin, abbreviated LM-12 for export or CZ-12 within China, is a Chinese medium-lift launch vehicle carrier rocket built by the Shanghai Academy of Spaceflight Technology.

[3] On 26 February 2024, the China Aerospace Science and Technology Corporation (CASC) released its annual "Blue Book" which detailed the company's launch plans for the coming year; one of the projects revealed in the Blue Book is the new Long March 12 medium-lift rocket.

Notably, this launch featured the new YF-100K rocket engine in its initial orbital launch attempt; the engine is a critical component of the under-development Long March 10 lunar rocket.

[2] In the future, SAST plans to introduce a variant with a reusable first stage: the Long March 12A (CZ-12A).

It is anticipated that the CZ-12A will use methane and liquid-oxygen rocket engines from commercial providers.