Linotype排字机是一种用于印刷的"整行铸造" 排字机。由其能够一次完整铸造一整行铅字而得名（line-o'-type），比起手工排字来说，这是一项重大的改进。

Linotype排字员在一个拥有90个字符的键盘上输入文本，排字机将会把每一行输入字符的阴模组成一整个单元。再经过热金属排字工艺从阴模字符单元套模后，完整的一行文本即被压铸成单独一个铅字（slug）。而字模单元在经过金属套模后，每个字符阴模随即返回排字机的字匣等待之后的调用。比起让排字工人手工排列每个字母，标点符号和空格的铅字来说，其可以极大地提升排字速度。

The linotype machine (/ˈlaɪnətaɪp/ LYN-ə-typ) is a "line casting" machine used in printing. Along with letterpress printing, linotype was the industry standard for newspapers, magazines and posters from the late 19th century to the 1960s and 70s, when it was largely replaced by offset lithography printing and computer typesetting. The name of the machine comes from the fact that it produces an entire line of metal type at once, hence a line-o'-type, a significant improvement over the previous industry standard, i.e., manual, letter-by-letter typesetting using a composing stick and drawers of letters.