Jacobi may refer to:
- People with the surname Jacobi
Mathematics:
- Jacobi sum, a type of character sum
- Jacobi method, a method for determining the solutions of a diagonally dominant system of linear equations
- Jacobi eigenvalue algorithm, a method for calculating the eigenvalues and eigenvectors of a real symmetric matrix
- Jacobi elliptic functions, a set of doubly-periodic functions
- Jacobi polynomials, a class of orthogonal polynomials
- Jacobi symbol, a generalization of the Legendre symbol
- Jacobi coordinates, a simplification of coordinates for an n-body system
- Jacobi identity for non-associative binary operations
- Jacobi's formula for the derivative of the determinant of a matrix
- Jacobi triple product an identity in the theory of theta functions
- Jacobi's theorem (disambiguation) (various)
Other:
- Jacobi Medical Center, New York
- Jacobi (grape), another name for the French/German wine grape Pinot Noir Précoce
- Jacobi (crater), a lunar impact crater in the southern highlands on the near side of the Moon
- Software_for_handling_chess_problems#Jacobi, chess software