Turbo Assembler (sometimes shortened to the name of the executable, TASM) is an assembler for software development published by Borland in 1989. It runs on and produces code for 16- or 32-bit x86 MS-DOS and compatible on Microsoft Windows. It can be used with Borland's other language products: Turbo Pascal, Turbo Basic, Turbo C, and Turbo C++. The Turbo Assembler package is bundled with Turbo Linker and is interoperable with Turbo Debugger.

Borland advertised Turbo Assembler as being 2-3 times faster than its primary competitor, Microsoft Macro Assembler (MASM). TASM can assemble source in a MASM-compatible mode or an ideal mode with a few enhancements. Object-Oriented programming was added in version 3. The last version of Turbo Assembler is 5.4, with files dated 1996 and patches up to 2010; it is still included with Delphi and C++Builder.

TASM itself is a 16-bit program. It will run on 16- and 32-bit versions of Windows, and produce code for the same versions, but it does not generate 64-bit x86 code.