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Brain tumor biopsies are essential for pathologic diagnosis. However, hemorrhagic complications after biopsies may occur, leading to suboptimal outcomes. This study aimed to evaluate the associated factors of hemorrhagic complications after brain tumor biopsies and propose countermeasures. We retrospectively collected data on 208 consecutive patients with brain tumors (malignant lymphoma or glioma) who underwent a biopsy from 2011–2020. We evaluated factors and microbleeds (MBs) in the tumor plus relative cerebral/tumoral blood flow (rCBF) at the biopsy site on preoperative magnetic resonance imaging (MRI). Postoperative all and symptomatic hemorrhage occurred in 21.6% and 9.6% of patients. In univariate analysis, a needle biopsy was significantly associated with the risk of all and symptomatic hemorrhages compared to techniques that allow adequate hemostatic manipulation (i.e., open and endoscopic biopsies). Multivariate analyses revealed that a needle biopsy and gliomas of World Health Organization (WHO) grade III/IV were significantly associated with postoperative all and symptomatic hemorrhages. Multiple lesions were also an independent risk factor for symptomatic hemorrhages. On preoperative MRI, abundant MBs in the tumor and MBs at the biopsy sites, in addition to high rCBF, were significantly associated with postoperative all and symptomatic hemorrhages. We recommend the following measures to prevent hemorrhagic complications: consider biopsy techniques that allow adequate hemostatic manipulation preferentially; perform more careful hemostasis in cases of suspected gliomas of WHO grade III/IV, multiple lesions, and abundant MBs in the tumors; and, if there are multiple candidate biopsy sites, select areas with lower rCBF and no MBs as a biopsy target. [ABSTRACT FROM AUTHOR]