Transgender and gender diverse (TGD) youth demonstrate low utilization of fertility preservation before medical and surgical gender-affirming interventions. However, a significant number of TGD youth have goals for parenthood and/or recognize that their attitude toward future family-building goals may change over time. In this narrative review, we conclude that TGD young people should have ongoing opportunities to discuss their family-building goals and options for fertility preservation. Validated decision tools can help facilitate these discussions. The number of transgender and gender diverse (TGD) youth seeking care continues to increase, necessitating comprehensive counseling about potential long-term effects of gender-affirming medical interventions on fertility. The objective of this narrative review was to examine fertility-related knowledge, attitudes, and decision-making (including factors influencing decisions, decision regret, and decision tools) among TGD youth. We searched PubMed, PsycInfo, and Google Scholar for original, peer-reviewed research investigating TGD youth attitudes and knowledge of fertility and fertility preservation, perspectives on fertility counseling and fertility preservation decision-making, as well as fertility-related decision tools. We reviewed 106 studies; eight were included in this narrative review. Four studies assessed TGD youth knowledge and attitudes of fertility and fertility preservation, three examined perspectives on fertility counseling and fertility preservation decision-making, and three discussed development of decision tools. Key findings were that: (1) many TGD youth are aware of potential fertility-related impacts of gender-affirming treatments, but there are still unmet informational needs, (2) some TGD youth report an interest in future biological parenthood, and of those who are not currently interested in biological parenthood, many acknowledge their desires may change over time, (3) ongoing discussions about fertility and fertility preservation are critical, and (4) decision tools are in development. In conclusion, TGD youth and their caregivers should receive ongoing, comprehensive fertility counseling and decision tools may be helpful to facilitate these discussions and decisions in each youth's gender-affirming care journey.