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Oscillator strengths in both length and velocity approximations have been obtained for transitions between the fifteen lowest lying states of Ca III with dominant configurations 3p6, 3p54s, 3p54p, and 3p53d calculated using the program of Hibbert.1 These states (all corresponding closely to a pure LS coupling scheme) were each represented by about twenty single electron configurations that allowed for internal, semi-internal, and all-external correlations by means of single and double electron excitations to pseudoorbitals 5 ¯ s , 5 ¯ p , 4 ¯ d , 4 ¯ f . Of these correlations the most important was found to be that linking 3p2 to 3d2 arrangements, a fact not previously recognized for this ion. The excitation energies calculated for these states agree satisfactorily with the previous experimental results of Borgstrom.2 By using these calculated states of Ca III as those of the residual ion in a close-coupling calculation, oscillator strengths between various discrete states of Ca II have been calculated together with the photoionization cross section from the ground state of this ion.