A gear baffle (46; 146; 246) for interacting with a lubricant fluid around a gear (38A, 38B) in a gas turbine engine, the gear baffle (46; 146; 246) comprising: a first interface (62A; 162A; 262A) for attaching the gear baffle (46; 146; 246) to a structure disposed to a first side of the gear (38A, 38B); a second interface (62B; 162B; 262B) for attaching the gear baffle (46; 146; 246) to a structure disposed to a second side of the gear (38A, 38B) opposite the first side of the gear (38A, 38B), the second interface (62B; 162B; 262B) being spaced apart from the first interface (62A; 162A; 262A) by a distance; and a main wall (58; 158; 258) interconnecting the first interface (62A; 162A; 262A) with the second interface (62B; 162B; 262B), the main wall (58; 158; 258) including a compliant corrugation (50; 150; 250) that is deformable to allow the main wall (58; 158; 258) to accommodate a variation in the distance between the first interface (62A; 162A; 262A) and the second interface (62B; 162B; 262B), the main wall including an inner side for facing the gear (38A, 38B) and an outer side opposite the inner side, characterised in that the gear baffle further comprises: a first sidewall (56A, 156A, 256A) attached to the main wall (58; 158; 258) and extending from main wall (58; 158; 258), the first interface (62A; 162A; 262A) being disposed on the first sidewall (56A, 156A, 256A); and a second sidewall (56B, 156B, 256B) attached to the main wall (58; 158; 258) and extending from main wall (58; 158; 258), the second interface (62B; 162B; 262B) being disposed on the second sidewall (56B, 156B, 256B), wherein the main wall (58; 158; 258), the first sidewall (56A, 156A, 256A) and the second sidewall (56B, 156B, 256B) cooperatively define a receptacle for receiving part of the gear (38A, 38B) therein. a first interface (62A; 162A; 262A) for attaching the gear baffle (46; 146; 246) to a structure disposed to a first side of the gear (38A, 38B); a second interface (62B; 162B; 262B) for attaching the gear baffle (46; 146; 246) to a structure disposed to a second side of the gear (38A, 38B) opposite the first side of the gear (38A, 38B), the second interface (62B; 162B; 262B) being spaced apart from the first interface (62A; 162A; 262A) by a distance; and a main wall (58; 158; 258) interconnecting the first interface (62A; 162A; 262A) with the second interface (62B; 162B; 262B), the main wall (58; 158; 258) including a compliant corrugation (50; 150; 250) that is deformable to allow the main wall (58; 158; 258) to accommodate a variation in the distance between the first interface (62A; 162A; 262A) and the second interface (62B; 162B; 262B), the main wall including an inner side for facing the gear (38A, 38B) and an outer side opposite the inner side, a first sidewall (56A, 156A, 256A) attached to the main wall (58; 158; 258) and extending from main wall (58; 158; 258), the first interface (62A; 162A; 262A) being disposed on the first sidewall (56A, 156A, 256A); and a second sidewall (56B, 156B, 256B) attached to the main wall (58; 158; 258) and extending from main wall (58; 158; 258), the second interface (62B; 162B; 262B) being disposed on the second sidewall (56B, 156B, 256B), wherein the main wall (58; 158; 258), the first sidewall (56A, 156A, 256A) and the second sidewall (56B, 156B, 256B) cooperatively define a receptacle for receiving part of the gear (38A, 38B) therein.