In 2013, Mack was hired as a partner at lobbying firm Liberty Partners Group, where his father was a chairman [[emeritus]].<ref name="liberty">{{cite web|url=httphttps://thehill.com/business-a-lobbying/293859147607-exformer-rep-connie-mack-joins-lobby-firm/|title=Former Rep. Connie Mack joins lobby firm|work=The Hill|date=15 April 2013}}</ref> Following his unsuccessful bid for the Senate, Mack founded two lobbying and consulting firms, Mack Strategies and Liberty International Group. In March 2014, he registered to become a lobbyist for [[American Task Force Argentina]]. As of September 2014, he was an executive vice president of [[public relations]] firm Levick as well as a registered lobbyist for Levick, [[Doral Financial]] and [[Las Vegas Sands]].<ref>{{cite news|last1=Ho|first1=Catherine|title=Crisis communications firm Levick continues push to grow lobbying business, hires former Fla. congressman|url=https://www.washingtonpost.com/business/capitalbusiness/former-fla-congressman-connie-mack-iv-joins-crisis-pr-firm-levick/2014/09/26/4905d5e4-4409-11e4-9a15-137aa0153527_story.html|access-date=17 August 2016|newspaper=[[The Washington Post]]|date=September 28, 2014}}</ref> Mack considered entering [[2014 Florida's 19th congressional district special election|Florida's 19th congressional district special election]] in 2014 to replace [[Trey Radel]] but, in January 2014, officially declined to enter the race.<ref>{{cite news|last1=Singer|first1=Paul|date=January 29, 2014|title=No comeback for Connie Mack|work=[[USA Today]]|url=https://www.usatoday.com/story/news/politics/onpolitics/2014/01/29/no-comeback-for-connie-mack/81544754/|access-date=30 September 2021}}</ref>
=== International lobbying ===
Mack has also worked extensively as a lobbyist for the government of [[Hungary]].<ref name=hungary>{{cite news| url=https://www.huffingtonpost.com/2014/11/20/hungary-connie-mack_n_6193522.html | work=Huffington Post | title=Diplomatic Dust-Up Means Big Bucks For Former GOP Congressman Connie Mack IV | date=November 20, 2014}}</ref><ref>{{cite news|last1=Goad|first1=Ben|title=Hungary taps ex-congressman as US spokesman|url=httphttps://thehill.com/business-a-lobbying/253909-hungary-taps-ex-congressman-as-us-spokesman/|access-date=17 August 2016|work=[[The Hill (newspaper)|The Hill]]|date=16 September 2015}}</ref> In December 2020, Mack joined Platinum Advisors DC to lobby in support of increased humanitarian assistance to [[Ethiopia]].<ref>{{Cite web|last=Oprysko|first=Caitlin|title=Who is lobbying in the Ethiopia conflict as Coons heads to Addis Ababa|url=https://politi.co/3vI64Bn|access-date=2021-10-11|website=POLITICO|date=19 March 2021 |language=en}}</ref>
