BLAS（Basic Linear Algebra Subprograms，基础线性代数进程集）是一个应用进程接口（API）标准，用以规范发布基础线性代数操作的数值库（如矢量或矩阵乘法）。该进程集最初发布于1979年，并用于创建更大的数值进程包（如LAPACK）。在高性能计算领域，BLAS被广泛使用。例如，LINPACK的运算成绩则很大程度上取决于BLAS中子进程DGEMM的表现。

为提高性能，各软硬件厂商则针对其产品对BLAS接口实现进行高度最佳化。

Basic Linear Algebra Subprograms (BLAS) is a specification that prescribes a set of low-level routines for performing common linear algebra operations such as vector addition, scalar multiplication, dot products, linear combinations, and matrix multiplication. They are the de facto standard low-level routines for linear algebra libraries; the routines have bindings for both C and Fortran. Although the BLAS specification is general, BLAS implementations are often optimized for speed on a particular machine, so using them can bring substantial performance benefits. BLAS implementations will take advantage of special floating point hardware such as vector registers or SIMD instructions.