The increase in intracellular calcium ion concentration is a general signaling mechanism used in many biological systems. In T lymphocytes, calcium is essential for activation, differentiation, and effector functions. In this study, we will summarize recent developments of how intracellular calcium concentrations are modified in T cells to affect the activity of three major calcium-dependent transcriptional effectors, i.e., NFAT, MEF2, and DREAM, involved in cytokine gene expression.