Casuarina equisetifolia, a multipurpose tree species, is an important raw material for many major paper mills in India. Institute of Forest Genetics and Tree Breeding (IFGTB), Coimbatore, India is the focal point of Casuarina research in the country and has the largest germplasm assemblage in India. A study was undertaken at IFGTB to understand the wood fibre characteristics in select clones of this species as fibre characteristics like fibre length, fibre diameter, wall thickness and lumen diameter influence the quality of pulp and paper products. Wood samples collected from 43 clones and three seedling origin materials of C. equisetifolia were subjected to various analyses. The maximum value for fibre length was registered by clone CE 268 (1986.23 __ampersandsignmu;m). Clone CE 327 recorded the minimum value (1243.18 __ampersandsignmu;m). Fibre diameter ranged from 21.14 (CH 2803) to 29.59 __ampersandsignmu;m (CE 224). Lumen diameter exhibited a wide variation between 6.17 to 17.10 __ampersandsignmu;m. Fibre cell wall thickness varied widely from 4.99 to 10.07 __ampersandsignmu;m. The minimum and maximum values were shown by clones CE 268 and CE 224 respectively. Ray height varied from 380.25 (CE 281) to 564.00 __ampersandsignmu;m (CE 2002/1). The values for ray width ranged between 23.56 to 43.23 __ampersandsignmu;m. Clones TNVM 3 and TNPV 4 registered the minimum and maximum values respectively. With reference to ray frequency, clone CH 2803 registered the minimum value (20.60 no. per mm.). Clone CE 276 recorded the maximum (56.56 no. per mm.). Various rations like Felting coefficient, Coefficient of fibre flexibility, Runkel__ampersandsignrsquo;s ratio and Isenberg coefficient were also worked out. Clones with high Felting coefficient and Coefficient of fibre flexibility but low Runkel__ampersandsignrsquo;s ratio and Isenberg coefficient are ideal for pulp. In the present study it was observed that clones CE 83, CE 100, CE 268, CE 2003/3, CE 2003/4, TCR 120203, APKKD 6 and JKCE 8 in general were suitable for quality pulp production