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Studies from five independent laboratories conclude that bone marrow stem cells transdifferentiate into endometrial stroma, epithelium, and endothelium. We investigated the nature of bone marrow‐derived cells in the mouse endometrium by reconstituting irradiated wild type recipients with bone marrow containing transgenic  mTert‐ green fluorescent protein (GFP) or  chicken  β ‐actin  ( Ch  β ‐actin ) ‐ GFP reporters.  mTert‐ GFP is a telomerase marker identifying hematopoietic stem cells and subpopulations of epithelial, endothelial, and immune cells in the endometrium.  Ch  β ‐actin ‐GFP is a ubiquitous reporter previously used to identify bone marrow‐derived cells in the endometrium. Confocal fluorescence microscopy for GFP and markers of endometrial and immune cells were used to characterize bone marrow‐derived cells in the endometrium of transplant recipients. No evidence of GFP +  bone marrow‐derived stroma, epithelium, or endothelium was observed in the endometrium of  mTert ‐GFP or  Ch  β ‐actin‐ GFP recipients. All GFP +  cells detected in the endometrium were immune cells expressing the pan leukocyte marker CD45, including CD3 +  T cells and F4/80 +  macrophages. Further examination of the  Ch  β ‐actin ‐GFP transplant model revealed that bone marrow‐derived F4/80 +  macrophages immunostained weakly for CD45. These macrophages were abundant in the stroma, infiltrated the epithelial and vascular compartments, and could easily be mistaken for bone marrow‐derived endometrial cells. We conclude that it is unlikely that bone marrow cells are able to transdifferentiate into endometrial stroma, epithelium, and endothelium. This result has important therapeutic implications, as the expectation that bone marrow stem cells contribute directly to endometrial regeneration is shaping strategies designed to regenerate endometrium in Asherman's syndrome and to control aberrant endometrial growth in endometriosis. S tem  C ells   2018;36:91–102

Bone Marrow Stem Cells Do Not Contribute to Endometrial Cell Lineages in Chimeric Mouse Models