Incumbent Sid Miller (R) and Nate Sheets (R) are running in the Republican primary for Texas Commissioner of Agriculture on March 3, 2026.

Gov. Greg Abbott (R) endorsed Sheets in January 2026. The Texas Tribune's Kate McGee said the endorsement was "an exceptionally rare rebuke of a fellow Republican official and Trump ally by Abbott, who has mostly stayed out of statewide elected races." Writing in the Austin American-Statesman, John Moritz said Miller was "among conservatives who sued Abbott for extending early voting periods during the COVID crisis in 2020, and he briefly considered challenging the governor in the 2022 GOP primary."

Miller was first elected agriculture commissioner in 2014 and earlier served 12 years in the Texas House of Representatives. Miller is a rancher who breeds quarter horses. Miller is running on his record, saying he had "turned deficits into surpluses, crises into comebacks, and opened doors worldwide. But there’s more to do, like fighting federal overreach on endangered species, promoting vocational ag education, and ensuring our water and land stay in Texas hands." As of February 2026, Texas Right to Life and 10 members of the U.S. House had endorsed Miller.

Sheets is a businessman and the founder of Nature Nate's honey. Sheets says he is "a producer, a businessman, and a father who believes Texas needs new leadership rooted in real-world experience and eternal values." Sheets says he is running because he "knows firsthand the challenges that Texas ranchers face — from water access and soil health to labor shortages and government overreach." Gun Owners of America and former U.S. Sen. Rick Santorum (R-Penn.) endorsed Sheets.

In 2022, Miller defeated Susan Hays (D) 56%–44%. The last Democrat to win an agriculture commissioner election in Texas was Jim Hightower (D) in 1986.