Objectives To describe Scottish adolescents’ sun-related behaviours and tanning attitudes and assess associations with skin cancer awareness. Design Cross-sectional study. Setting 20 state secondary schools in one Scottish local authority (Glasgow City). Participants 2173 adolescents (females: 50.7%, n=1102) with a mean age of 12.4 (SD=0.55). Outcome measures Sun-related behaviour (suntan, sunbathing, sunburn, sunscreen use, sunbed use), tanning attitudes, skin cancer-related symptom and risk factor awareness. Results Adolescents reported poor sun-related practice: 51% of adolescents reported sunburn the previous summer of whom 38% indicated sunburn on more than one occasion. Skin cancer awareness was low: 45% recognised ‘change in the appearance of a mole’ as a cancer symptom, and 39% agreed that ‘getting sunburnt more than once as a child’ increased cancer risk. 42% and 26% of adolescents, respectively, reported that friends and family held protanning attitudes. Compared with males, females were statistically significantly more likely to: report sunbathing (p