The Housing Choice Voucher (HCV) Program is the largest rental housing subsidy program in the United States and has the potential to increase housing options for low-income families. In order to realize this potential, however, the program must attract landlords who accept housing choice vouchers. The primary objectives of this study are: 1) to provide insights from Public Housing Authority (PHA) staff on the factors associated with landlord decisions about whether to participate in the program; and 2) to identify a collection of promising and innovative practices that PHAs have used to increase landlord participation. The study provides key insights into landlord participation in the HCV program and the perspectives of PHA staff on factors influencing landlord decisions on whether to participate. The study also identifies a diverse collection of innovative activities adopted by PHAs to mitigate financial concerns among landlords, make the HCV program simpler, and alleviate landlord concerns about HCV tenants. The study finds that a majority of PHA staff interviewed identified financial reasons as the most important factor affecting landlord participation - with payment standards and fair market rents, damage costs and security deposits, and profit motivations cited as key determining factors.