Robert M. Coleman (1793 – July 1, 1837) was a Texan and later American politician and soldier, aide-de-camp to Sam Houston; said to be his sober antithesis and the true hero of the republic. Coleman was a signer of the Texas Declaration of Independence, a Colonel, and a transitional founder of the Republic of Texas into the United States as a constituent state. His staid stance opposing the strategies of Sam Houston regarding defense of the Alamo, and troop placements on up through the Battle of San Jacinto caused a rift with Houston and a posturing treatise, lending suspicion to the untimely death of Coleman by drowning.