We investigate in-group gender bias in real-world hiring decisions by combining administrative data with data from a large-scale field experiment on hiring in which fictitious resumes with randomly assigned information about gender were sent to Swedish employers. Our results suggest that women (female recruiters or firms with a high share of female employees) favor women in the recruitment process. In contrast, we do not find much evidence that men (male recruiters or firms with a high share of male employees) favor men.