Joseph Ryan Gruters (born July 6, 1977) is an American politician and accountant who has served as the 67th chairman of the Republican National Committee (RNC) since 2025. He has been a member of the Florida Senate since 2018 and formerly the treasurer of the RNC. A member of the Republican Party, he previously served in the Florida House of Representatives from 2016 to 2018 and was the chair of the Florida Republican Party from 2019 to 2023. He became chair of the national party during the summer meeting of the party on August 22, 2025.

Gruters was born on July 6, 1977, in Tampa, Florida. Gruters graduated from Cardinal Mooney High School in Sarasota. He received a BS degree from Florida State University and an MBA degree from the University of South Florida.

Gruters lost his first two elections and worked behind the scenes on several more losing campaigns. He joined Vern Buchanan’s original successful 2006 campaign for Congress. Gruters subsequently was chairman of the Republican Party of Sarasota for ten years, longer than any of his predecessors.

Gruters advanced politically as an early supporter of Rick Scott during his successful 2010 campaign for governor of Florida. That support earned Gruters an appointment by the governor to the Florida State University board of trustees. In 2015, he became vice chairman of the Republican Party of Florida (RPOF) and had strong political backers when he ran for a Florida House of Representatives seat in 2016. Gruters also is one of Donald Trump's closest political allies in Florida. An early Trump supporter, Gruters was Florida co-chairman of Trump's 2016 campaign. Gruters forged a relationship with Donald Trump in 2012 after Republican leaders snubbed the New York celebrity at the Republican National Convention in Tampa, Florida, that also would advance him. Trump accepted an invitation from Gruters to speak in Sarasota the night before the convention. Gruters arranged for Trump to be declared "Statesman of the year" several times at Republican political functions in Sarasota. In 2023, Gruters was appointed by Trump to manage the funds in a tax-exempt nonprofit that allows dark money donors to Trump to remain anonymous to both the public and to the IRS under Section 527 of the U.S. Internal Revenue Code, the Patriot Legal Defense Fund that is described as Trump's legal defense expense fund. On April 17, 2025, the president announced that he appointed Gruters to the latest version of the White House Homeland Security Council and a local Florida publication noted the continuing financial dividends Gruters reaps from his relationship to the president.

Gruters was elected to a two-year term as chairman of the Republican Party of Florida on January 11, 2019, at the party's annual meeting in Orlando, winning a two-year term. He defeated Bob Starr of Charlotte County and succeeded state Representative Blaise Ingoglia. Gruters passed out red "Keep Florida Great" hats ahead of the vote and declared that his "singular focus over the next two years" was winning reelection for Trump in 2020. Gruters's easy election coincides with more internal unity among the Florida Republican Party, which had been divided after a Jim Greer scandal and had suffered internal fractures during Governor Rick Scott's terms, when Scott withdrew financial and organization support for the party after Ingoglia had defeated Scott's preferred candidate. Although President Trump nominated Gruters to the Amtrak board of directors, subject to confirmation by the United States Senate, the confirmation was neither confirmed nor rejected, but was sent back to the president.

Gruters unanimously won a second two-year term as RPOF chairman in 2021.

Because relocation of many Republican voters from other states among the growing state population the gradual narrowing of the gap between Democrats and Republicans in Florida began to speed up and in two years, Florida Republicans had overtaken Democrats in voter registration. Florida voter registration numbers had risen to approximately 5.15 million registered Republicans compared to 4.47 million Democrats – translating into a GOP lead of more than 680,000 registered voters more than the Democrats. Data further showed that the emphasis on Republican voter registration was resulting in a 2022 registration advantage that was growing by roughly 30,000 voters every month. When Gruters took over the RPOF in 2019, Democrats held a 225,000 voter registration advantage, according to the Florida Division of Elections.

During his four-year chairmanship of the Republican Party of Florida, Gruters made voter registration a party priority. With funding help from Governor Ron DeSantis, the number of registered Republican voters surged in Florida during his tenure, This increase in voter registrations for the party and an associated get-out-the-vote campaign resulted in record wins for Florida Republicans in the 2022 midterm elections, including DeSantis at the top of the ticket winning 62 of Florida's 67 counties (which included the normally Democratic Miami-Dade and Palm Beach counties). The election also saw Republicans winning a super majority in both the Florida House and Senate.