Gmina Lubień Kujawski is an urban-rural gmina in Włocławek County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. Its seat is the town of Lubień Kujawski, which lies approximately 29 kilometres south of Włocławek and 79 km south-east of Toruń. The gmina covers an area of 150.21 square kilometres, and as of 2006 its total population is 7,514.