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|The Tatnall School|
|Motto||Omnia in Caritate
(All things in love)
|Type||Nonprofit, college-prep day school|
|Headmaster||Charles A. Tierney III|
|Founder||Frances D. S. Tatnall|
|Students||Grades 9-12 (130 girls, 130 boys)
Grades pre K through 8th (600 combined gender) (2011-2012)
|Location||1501 Barley Mill Road
Wilmington, DE 19807,
Greenville, Delaware, USA
|Colors||Black and Yellow|
The Tatnall School is a private college prep school in Greenville, Delaware, for students from three years old through 12th grade. The school was founded as an all-girls school in 1930 by Frances Dorr Swift Tatnall at her home in downtown Wilmington, Delaware, and moved to its current location in 1952. Tatnall began to admit boys in 1952 (the class of 1964). The school's mascot is the hornet. Its motto is "Omnia in caritate", which means all things in love.
- National Association of Independent Schools
- Delaware Association of Independent Schools
- Association of Delaware Valley Independent Schools
- National Association for College Admission Counseling
- Potomac and Chesapeake Association for College Admissions Counseling
- National Middle School Association
Tatnall competes as a member of the Delaware Independent School Conference in interscholastic sports such as cross country, field hockey, football, soccer, volleyball, cheerleading, basketball, ice hockey, swimming, wrestling, winter track, lacrosse, baseball, golf, tennis, and spring track. Tatnall is particularly strong in Cross Country and Track and Field (winning 34 State Championships since 2003); field hockey, and boy's lacrosse (winning 6 of 22 state championships). The ice hockey team also won 3 consecutive DSHA state championships from 2008-2010. Tatnall's girl's cross country team has run in the National Championship 7 times since 2006 and placed third in the nation in fall 2008 and again in 2011. They have also finished fifth (2010), twelfth (2006), thirteenth (2007), and 14th (2009) The girls' cross country team has won the Division II State Championship the past eleven years in a row and the boys' team has won the past six. The field hockey team has made it to the DIAA state tournament the past two years, making it to the final four in the 2013 season.
Tatnall offers a variety of visual and performing arts programs, including photography, drawing, instrumental and vocal performance. One notable instructor is Wilson gault somers, who is also a composer and performer; Somers was also a recipient of an Emmy award in 2000.  Students at the school are required to participate in art programs, and have won numerous state awards throughout the years. 
Tatnall was a Delaware polling booth in the 2008 United States presidential election. Senator Joe Biden (a native Pennsylvanian but Delaware resident since 1953), who lives near the school, cast his vote in Tatnall's main lobby in that election cycle.
- Ball, Frances S.T. (1972). Mrs. Tatnall and Her School. p. 72.
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