Previous studies posited that survivors of rape receive better treatment from the police when advocates are involved and the police embrace collaboration. However, the collaborative relationship between the Nigerian police and rape victim advocates has yet to receive scholarly attention. To address this, a qualitative study was conducted, with 24 police officers of sexual offense units in six Police Commands, and 50 rape victim advocates from 28 advocacy groups. A thematic analysis of the narratives was carried out. Findings indicated problematic police-advocate collaboration in the process of reporting, interviewing, investigating, and prosecuting rape cases. Advocates stated that officers exhibited rape myth acceptance. Officers stated that advocates often display aggressive approaches in interfering with interviews, are ignorant of police procedures, and often wrongly accuse officers of corrupt practices. These findings have important practical, policy, and further research implications if criminal justice efficiencies and ideal victim support services are to be achieved.