Follow the steps below to continue on your journey to becoming part of the Celt Family!

If you have already activated your Celt Login ID, please skip this step.

  • View guide for first time access to Outlook and Office 365.
  • If this is your first time logging into a UST system you will need to visit Microsoft 365 to set your password and security questions before you will be able to access myStThom
    • First time username for incoming students will be the first portion of your UST issued email address - eg. (email), username would be: aquinast
    • First time password for incoming students will be the first three letters of your first name + first three letters of your last name (uppercase) + your 7 digit UST Student ID number.

Once you have succesfully created your O365 login credentials you will then have access to: UST Webmail, MyStthom, and Blackboard.

For more information, please contact the IT Help Desk at or 713-525-6900.

Submit your $200 enrollment deposit* to secure your place in the entering class. Please contact the Office of Undergraduate Admissions at or 713-525-3500 if you have any questions.

Pay your Deposit Online:

You can access our online payment system here. Please make sure you are accessing the payment system from a PC.

  1. Enter your Student ID, First Name and Last Name as it appears on your acceptance package or acceptance email.
  2. This will prompt a redirect to our payment page (pop ups will need to be allowed.)
  3. Complete the payment information.

*Please make sure you are NOT logged in to your UST account before accessing the enrollment deposit system.

Pay Your Deposit by Mail
You can mail in your payment to:

University of St. Thomas
Office of Undergraduate Admissions 
3800 Montrose Blvd.
Box #7
Houston, TX 77006

Please make sure to include UST ID number and first and last name as it appears on your acceptance package.

Pay Your Deposit on Campus
If you plan to visit our campus for a tour or event you can bring your enrollment deposit with you!  Deposits must be paid before arriving to your registration appointment.

Questions be directed to or 713-525-3500.

If you are younger than 22 evidence of vaccination must be submitted in one of the following three formats:
  • A UST immunization form*
  • An official immunization record from a state or local health authority*
  • An official record received from state officials, including a record from another state

Whatever you submit must include the month, day and year the vaccination was administered.

*Must be signed or stamped by a certified, licensed physician or his/her designee, or public health personnel.

  • Immunization records can be submitted through your MYSTTHOM, using the Immunization Form Upload tile located on your homepage.

More information is available at Office of Health Promotion & Wellness. Questions, concerns and records can be submitted to or 713-525-3513.

NOTE: students will not be able to register for classes or sign up for housing until the appropriate records are on file.

Once you’ve submitted your enrollment deposit, immunization records (if applicable) and set up your technology, you’re officially a UST student!

Attention students admitted to the Peavy School of Nursing, please return your signed acceptance letter to . We will need this before you can enroll in classes.

Now it’s time to tackle these items:

Every student is required to meet with an advisor before enrolling in classes. Students should contact their admissions counselors for details.

Register for Classes

Registration appointments arranged through the admissions office will give new students the opportunity to meet with an academic advisor; make class selections; discuss degrees, programs and majors; and register for classes.

Orientation is a fantastic experience, where you will be able to meet your future classmates and obtain important information about the Celt experience! The experience is highly encouraged for you to set off on the right Celt path.

Orientation Dates:

(Registration details will be released soon)

Have additional questions? Email us at or the Assistant Director of Student Leadership & Engagement, Eveleny Plata at

Note: You must pay the enrollment deposit and submit immunization records (if under the age of 22) before registering for Orientation. You will need your UST ID, First Name and Last Name. Payment can be made by here.