Introduction Maternal attitudes have been shown to impact adolescent girls' sexual decision making and attitudes towards contraception. Given the potential for maternal influence on adolescent contraceptive use, we undertook an exploratory study of mothers' perceptions of the maternal role in adolescent contraceptive decision making, and maternal perceptions of long acting reversible contraceptives (LARC) for adolescent girls. Materials and methods We utilized a mixed methods study design. Acceptability of contraceptive methods and attitudes towards adolescent contraceptive use were assessed using a paper survey of 162 mothers of girls aged 11-19 years in Cleveland, Ohio, USA. Seven survey participants completed subsequent semi-structured interviews, which were analyzed using grounded theory methodology. Results Pills, condoms and injections were most frequently selected as acceptable by 55.4%, 55.4%, and 51.6% of women, respectively. One or more LARC methods were selected by 16.6% of the women. Of those (94.4%) agreed or strongly agreed that, "It is expected of me to make sure that my daughter knows about birth control methods." Important themes that emerged during interviews were the responsibility mothers felt to help their daughters navigate contraception options, appreciation of the effectiveness of LARC methods and concerns about the use of those methods by teenagers due to the invasiveness. Conclusion Our data suggest that mothers want to be involved and support adolescent decision making about contraceptives. We also found that mothers viewed LARC as less acceptable than other forms of birth control for adolescents and have specific concerns about LARC. These results suggest directions for future work to better characterize the impact of maternal attitudes on adolescent LARC use.