Is Linux a programming language?

Linux is not an programming language.

It’s open source operating system found by Linus Torvalds.

Linux provide you an environment to execute various programming languages.

Linux has C compiler by default where you can able to execute C/C++ program.

What programming language are operating systems written in?

All kernels will use some assembly code as well. Mac OS X: Cocoa mostly in Objective-C. Kernel written in C, some parts in assembly. Windows: C, C++, C#. Some parts in assembler.