We report an experimental and theoretical investigation of bubble collisions on parallel arranged fibers. Using high speed videography, we visualized the impact outcomes and classified them into three modes: capturing, single bubble rising, and splitting. The experimental results demonstrate that the impact mode is mainly determined by the distance between the fibers as well as the rising speed of the bubble. We present the results in a regime map, displaying the dependence of the impact outcomes on dimensionless parameters: We(b) = rho U-b(2) D/sigma, Bo = rho gD(2)/sigma, and d/D in the range of 0 <= We(b) <= 25, 0.4 <= Bo <= 0.7, 0.30 <= d/D <= 0.75, where rho is the liquid density, U-b is the collision speed of bubble, D is the bubble diameter, sigma is the surface tension, g is the gravitational acceleration, and d is the inter-fiber distance. The observed regime boundaries are explained with scale analysis. We also examined the size of daughter bubbles for splitting cases, and the results unveil the critical dependence of the daughter bubble size on the impact offset rather than on the collision speed. The results are expected to be widely used to control bubble filtration or generation in a variety of engineering systems aimed at improving heat and mass transfer using bubbles. (C) 2019 Elsevier Ltd. All rights reserved.