In-tube condensation of R-11 was experimentally investigated with various surface inclination angle between the direction of the vapor flow and the gravitational force, phi. The two-phase flow patterns were observed visually and the transition locations between different flow patterns were measured in a transparent test section. The vapor quality distribution along the test tube and the measured transition locations were used to prepare a flow pattern map. The experimental results indicated that the surface inclination, phi, strongly influenced the vapor and condensate distribution. Annular flow spanned the whole tube for phi = 0 degrees at various vapor flow rates. Annular flow and stratified flow patterns were observed for phi = 45 degrees and 60 degrees. Annular flow, stratified flow, half-slug flow, and slug flow exist in sequence for phi = 90-120 degrees. Annular flow, churn flow and slug flow occurred for phi = 180 degrees. The possible prediction of flow patterns for in-tube condensation in a microgravity environment was discussed briefly.