LZMA（Lempel-Ziv-Markov chain-Algorithm的缩写）是2001年以来得到发展的一个数据压缩算法，它用于7-Zip归档工具中的7z格式和 Unix-like 下的 xz 格式。它使用类似于LZ77的字典编码机制，在一般的情况下压缩率比bzip2为高，用于压缩的字典文件大小可达4GB。

C++语言写成的LZMA开放源码压缩库使用了区间编码支持的LZ77改进压缩算法以及特殊的用于二进制的预处理进程。LZMA 对数据流、重复串行大小以及重续串行位置单独进行了压缩。LZMA支持几种散列链变体、二叉树以及基数树作为它的字典查找算法基础。

The Lempel–Ziv–Markov chain algorithm (LZMA) is an algorithm used to perform lossless data compression. It has been under development either since 1996 or 1998 and was first used in the 7z format of the 7-Zip archiver. This algorithm uses a dictionary compression scheme somewhat similar to the LZ77 algorithm published by Abraham Lempel and Jacob Ziv in 1977 and features a high compression ratio (generally higher than bzip2) and a variable compression-dictionary size (up to 4 GB), while still maintaining decompression speed similar to other commonly used compression algorithms.