<p>Paddy soils, characterised by perpetual water saturation, provide unique geotechnical engineering issues due to their high compressibility and diminished shear strength leading to settlement and landslides. The strength and stability of these soils can be increased by applying ground improvement techniques like chemical stabilisation or preloading. This research explores the influence of nano titanium dioxide(N-TiO₂) on the physical and engineering behaviour of paddy clay that has been optimally treated with lime. The dosages of 0.5%, 0.7%, 1% and 1.2% N-TiO₂ were selected. The treated specimens underwent a curing process lasting 1,7,14 and 28 days. A series of tests on consistency, compaction, compressive strength and consolidation were carried out. The liquid limit, plastic limit and plasticity index of paddy clay treated with N-TiO₂ reduced to 56%,32% and 24% at 1.2% N-TiO₂. The maximum strength improvement of 292% was achieved when paddy clay was treated with 0.7% N-TiO₂ alone. The combination of 6% lime and 1%N-TiO₂ is found to be beneficial in improving the strength of paddy clay by 124%. The compression index of the paddy clay-lime-N-TiO₂ mixture reduced from 0.528 to 0.177. The mineral composition was determined using an X-ray diffraction test. The microstructural and chemical mechanisms governing the behavioural changes were determined through Scanning Electron Microscopy-Energy Dispersive X-ray spectroscopy, Fourier Transform Infrared Spectroscopy and Brunauer-Emmett-Teller analyses.</p>