Just a few I researched this morning.
Bertrand won the C2 football championship in 1991 beating Bloomfield 16-15. The Vikings followed it up with a 1992 Class C2 basketball championship, beating Shelby 69-56.
Bishop Neumann won the C1 football championship in 2002, beating Gothenburg 28-13. The Cavs followed it up with a 2003 basketball title, beating Chase County 68-52.
Cambridge won the C2 football championship in 2003, beating Crofton 22-14. The Trojans followed it up with a 2004 Class C2 basketball championship, beating Louisville 58-50.
Creighton Prep won the Class A football championship in 1980, beating Burke 24-7. The Junior Jays followed that with a 1981 Class A basketball championship, beating Omaha Benson 54-53.
Exeter-Milligan won the Class D2 football championship in 2014, beating Anselmo-Merna 40-26. The Timberwolves followed that with a 2015 Class D2 basketball championship, beating Bancroft-Rosalie 67-62 in two overtimes.
Falls City Sacred Heart did it twice. 1989 football, 1990 basketball, 1990 football, 1991 basketball
Grant has done it three times in C2. They won 1980 football, followed by 1981 basketball. Again in 1988 football and 1989 basketball, and 1989 football and 1990 basketball.
Guardian Angles Central Catholic won the D1 football championship in 2010, beating Creighton 45-30. The Bluejays followed that with a 2011 basketball championship, beating Howells 73-63.
Hastings St. Cecilia won the C1 football championship in 2009, beating Norfolk Catholic 26-18. They followed that up with a 2010 C1 basketball championship beating Chadron 46-40.