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Working together for student academic success by providing nutritious meals in a cost effective and pleasant environment.


 District calendars are listed and approved two years in advance. For individual schools, only campuses with Google Calendars are featured here.


NISD's mission is to provide all NISD students who are eligible to ride the bus a safe, efficient, nurturing environment that supports the educational and extra-curricular objectives of the district.


Northside ISD continues to enforce its “No Shots, No School” policy. Texas law requires all public school children have current immunizations in order to attend class.

Campus Information

Year Open:

School Mascot: Owls

School Colors: Royal Blue, White

Mission Statement:
Inspire and empower learners in a safe, respectful environment.

Head shot of Principal, Cathy M. De Leon, Principal
Cathy M. De Leon - Principal
Cathy Marie De Leon began her career in education in 1999 as a teacher at Alkek Elementary in Bandera ISD. Mrs. De Leon joined Northside ISD in 2001 as a classroom teacher at Eduardo Villarreal, Jr Elementary. In 2008, Mrs. De Leon was selected as the Administrative Intern for Bob Beard Elementary and the following year, served as the Intern on both Beard and Paul Ott Elementary. In 2010, Mrs. De Leon was appointed Vice Principal of Peggy Carnahan Elementary.

Mrs. De Leon and her husband relocated to Laredo, TX in 2013 where she served as the Assistant Principal at Leon Daiches Elementary in Laredo ISD. In 2016, Mrs. De Leon was appointed Principal of C.M. Macdonell Elementary.

Mrs. De Leon and her family returned to the San Antonio area in 2019 and she currently serves the Glenoaks Elementary community as Principal.

Mrs. De Leon received her Bachelor's Degree from Schreiner College, Kerrville, TX and a Master's Degree in Education from the University of Texas at San Antonio.

She and her husband have a son.
Head shot of Cynthia Castillo, Vice Principal
Cynthia Castillo - Associate Principal

The Associate Principal also serves as the Campus Behavior Coordinator. They can be reached by email at cynthia.castillo@nisd.net or by phone at 210-397-2315.

Cynthia Castillo began her career in Somerset ISD in 2011 where she taught Pre-K, third grade, and fourth grade. Dr. Castillo joined the Northside ISD family in 2016 and served as a first grade ESL Teacher and Math Specialist at Mead Elementary, and as Administrator Intern at Carnahan Elementary. Dr. Castillo was appointed the Vice Principal of Glenoaks Elementary in 2020.

Dr. Castillo earned a Bachelor's Degree in Interdisciplinary Studies, a Master's Degree in Educational Leadership and Policy Studies, and a Ph.D. in Educational Leadership from the University of Texas at San Antonio. Go Roadrunners!

A note from Dr. Castillo: I am so proud to serve the community of Glenoaks Elementary. I believe in the importance of humanizing, caring, meaningful experiences for our students, staff, and community. I know that we will work together through good times and challenging times. Our students are always our top priority, and we will do all that we can to ensure their success in all respects. Go Owls!

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