Considering the coping effect and health connections of diary-keeping behaviour, the purpose of the present study was to investigate diary-keeping in relation to happiness and gender among Turkish teacher trainees. A sample of 417 teacher trainees between the ages of 18 and 29 was surveyed. Happiness was considered as consisting of positive and negative affect and life satisfaction. The results revealed mostly dissatisfaction with life among Turkish teacher trainees. Females reported more negative affect than males do. Although no significant relationships were found between happiness and diary-keeping, gender differences in diary-keeping behaviour were found in favour of females. (Contains 3 tables.)