LAPACK++ (Linear Algebra PACKage in C++) is a software library for numerical linear algebra that solves systems of linear equations and eigenvalue problems on high performance computer architectures. LAPACK++ includes support for solving linear systems using LU, Cholesky, QR matrix factorizations, and symmetric eigenvalue problems. Computational routines are provided for various matrix classes for vectors, non-symmetric matrices, SPD matrices, symmetric matrices, banded, triangular, and tridiagonal matrices. Version 1.1 does not include all of the capabilities of original f77 LAPACK. Emphasis is given to routines for solving linear systems consisting of non-symmetric matrices, symmetric positive definite systems, and solving linear least-square systems.