The current study aimed to assess whether a single-session growth mindset intervention was effective in increasing beliefs in a growth mindset and academic motivation among fifth-grade students. Academic motivation and subsequent achievement tend to show declines with age and increasing difficulty in classes, and this was exacerbated during the recent COVID-19 pandemic. Additionally, while growth mindset interventions have shown to be effective in increasing motivation and achievement, no research has been conducted among elementary populations. This study, therefore, looked to answer whether implementation of a one-time growth mindset intervention with 41 fifth grade students would increase students' scores on a growth mindset scale, as well as their scores on an academic motivation scale. This quasi-experimental nonequivalent control group study implemented the growth mindset intervention with two-thirds of the participants, and it was predicted that these students' beliefs in a growth mindset and their academic motivation would increase from pre- to post-intervention over and above that of the control group. Additionally, it was predicted that the intervention would be effective for all students regardless of their classification as general education or special education students. Exploratory non-parametric analyses were run and found non-significant results. Therefore, contrary to previous research findings, the current single-session growth mindset intervention was not effective in increasing growth mindset or academic motivation among a sample of fifth-grade students. Several limitations were present in this study, including a small sample size, limited sensitivity of the measures used, and participants having previous knowledge of the growth mindset. Future research, therefore, should examine this single-session growth mindset intervention with a larger sample size of general education and special education students using more sensitive measures of growth mindset and academic motivation and controlling for prior knowledge of growth mindset. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]