Resistance to Uromyces fabae (Pers.) de Bary in lentil (Lens culinaris Medik) was studied in 16 crosses (including reciprocals) involving 3 resistant ('PL 4', 'Precoz' and 'E 153') and 3 susceptible ('PKVL 1', 'Sehore 74-3' and 'L 4149') genotypes. Crossing was made in 3 possible combinations, viz resistant x susceptible, resistant x resistant, and susceptible x susceptible types. Monogenic dominant control of gene action was observed in 10 F 2 crosses involving resistant x susceptible parent. This was further confirmed by F 2: 3 families analysis for rust reaction. Two crosses 'PL 4' x 'Precoz' and 'E 153' x 'Precoz', out of 3 crosses involving resistant parents indicated that dominant gene for rust resistance is different in these lines. Non-complementive nature of susceptibility was observed in the crosses involving susceptible parents.