Prior research suggests language concordance positively affects physician-patient communication and their relationship, but few studies have investigated language concordance in genetic counseling sessions for Spanish-speaking patients. This study explored Spanish-speaking genetic counselors' experiences and perceptions of the effects of Spanish language concordance on session processes and outcomes using the Reciprocal-Engagement Model (REM) of practice as a conceptual framework.There are 17 REM goals associated with four goal factors. A secondary purpose was to explore whether perceived effects are modified when the genetic counselor identifies as Latinx. Ten Latina and nine non-Latina Spanish-speaking genetic counselors who practice in the U.S. participated in semi-structured phone interviews. Directed content analysis yielded four themes reflecting how spoken language concordance promotes REM goal factors (Understanding and Appreciation, Support and Guidance, Facilitative Decision-Making, and Patient-Centered Education) and individual goals within each factor. Six additional themes also emerged: Patients feel grateful/relieved to have a genetic counselor who communicates directly in Spanish; Challenges are lessened (e.g., no need for an interpreter); Language interacts with other cultural similarities to achieve REM goals; Use of Spanish conveys genetic counselor is 'going above and beyond' for patients; Communicating medical information is difficult even when Spanish proficient; and Genetic counselor still able to achieve REM goals without language concordance. There were no apparent thematic differences between Latina and non-Latina genetic counselors. Results suggest language concordance positively influences relationship building and communication and facilitates achievement of REM goals. Proficiency in more than one language is 'value added' for genetic counseling services and should be encouraged in genetic counseling graduate programs and continuing education opportunities. Future research could assess patient perceptions of genetic counseling sessions in which the genetic counselor and patient use the patient's preferred language.