Standard treatment options for B cell malignancies include immunochemotherapies and/or targeted therapies, which often provide temporary disease remission. However, many patients do not achieve complete remission with these treatments, develop resistance, and eventually experience disease relapse. New immunomodulatory treatments, such as T cell-based therapies, show promise in treating various types of blood cancers, including B cell malignancies. However, their effectiveness is often limited by the immunosuppressive tumor microenvironment and altered function of patient-derived T cells. Ibrutinib, a Bruton tyrosine kinase inhibitor, has been shown to restore immune balance and function in patients with chronic lymphocytic leukemia. Ibrutinib is being studied as adjuvant or combinatorial therapy with chimeric antigen receptor (CAR) T cells or T cell-engaging bispecific antibodies for the treatment of B cell malignancies. Current evidence suggests that ibrutinib could be beneficial when used before, during, or after CAR T cell administration, potentially providing higher complete response rates and reduced toxicity. In conclusion, existing evidence strongly supports the combined use of ibrutinib and T cell therapies. However, additional clinical trials are needed to further validate the effectiveness of this treatment strategy in patients with various B cell malignancies.