Abstract: Provided herein are bifunctional compounds that inhibit MALT1 and/or promote targeted ubiquitination for the degradation of MALT1. In particular, provided are compounds that can bind MALT1, a protein whose activity is responsible for constitutive NF-KB signaling in certain cancers (e.g., activated B-cell diffuse large B-cell lymphoma (ABC-DLBCL)), and can assist in its degradation by recruiting an E3 ubiquitin ligase (e.g., Cereblon, VHL), which can ubiquitinate MALT1, marking it for proteasome degradation. Also provided are pharmaceutical compositions comprising the bifunctional compounds, methods of treating cancer with the bifunctional compounds, methods of promoting the degradation of MALT1, and methods of binding E3 ubiquitin ligase activity in a subject by administering a compound or composition described herein.