Methods for inducing, expanding, and/or generating alloantigen-specific regulatory T cells. Alloantigen-specific regulatory T cells can be induced, expanded, and/or generated from naive CD4+CD25− T cells by using CD40-activated B cells. The regulatory T cells can be human T cells. In one embodiment, the alloantigen-specific human regulatory T cells can be CD4highCD25+Foxp3+ regulatory T cells.