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Small molecules designed to specifically activate or inactivate protein functions have been useful to study biological processes. PROTACS are small molecule chimera which comprise a ligand and a peptide recognition motif for an E3 ligase. These novel reagents exploit the ubiquitin-mediated proteasome degradation pathway to target the ligand-bound protein for intracellular degradation. Here, we report that an estrogen receptor (ER)-targeting PROTACS that causes degradation of ER is able to potently inhibit endothelial cell differentiation in a three-dimensional angiogenic sprouting assay. These findings support the use of ER-targeting PROTACS as probes of angiogenesis.