Background: This study was conducted in the Department of Pathology, GMC Patiala on 100 patients over period of three years with the objective to study the comparison of the bone marrow aspiration and bone marrow trephine biopsy in haematological and non-haematological disorders in elderly age patients.(Age >50years). Methods: 100 cases with different hematological and non-hematological problems were taken up for the present study with age >50 years. Salah"s bone marrow aspiration needle and Jamshidi's bone marrow biopsy needle were used to collect the samples. For staining Leishmann's and H&E stains were used. Results: Majority of the cases were in the age of 50-60. Majority of haematological disorders comprised of anaemia (62%), leukemia(17.7%), multiple myeloma (7.5%), primary myelofibrosis(2.5%), myeloproliferative disorders(2.5%), hypocellular marrow (2.5%), increased eoisinophils and precurcors(1.2%), NHL (1.2%) lymphocytosis(1.2%) and plasmacytosis (1.2%). Both of the 2 cases of nonhaematological disorders were of metastatic carcinomatous deposists. Conclusion: The bone marrow aspiration and trephine biopsy were comparative in most of the haematological disorders except in primary and secondary myelofibrosis where biopsy provided clue to the diagnosis. Non-haematological disorders showed the same findings.