A Study of Obinutuzumab, Rituximab, Polatuzumab Vedotin, and Venetoclax in Relapsed or Refractory Follicular Lymphoma (FL) or Diffuse Large B-Cell Lymphoma (DLBCL)

Inclusion Criteria:

Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2
For obinutuzumab + polatuzumab vedotin + venetoclax treatment group, relapsed or refractory FL after treatment with at least one prior chemoimmunotherapy regimen that included an anti-cluster of differentiation 20 (CD20) (anti-CD20) monoclonal antibody (mAb) and for which no other more appropriate treatment option exists, as determined by the investigator
For rituximab + polatuzumab vedotin + venetoclax treatment group, relapsed or refractory DLBCL after treatment with at least one prior chemoimmunotherapy regimen that included an anti-CD20 mAb and for which no curative option exists as determined by the investigator
At least one bidimensionally measurable lesion

Exclusion Criteria:

Known CD20-negative status at relapse or progression
Prior allogeneic stem cell transplantation (SCT), or autologous SCT within 100 days prior to Day 1 of Cycle 1
Grade 3b FL
History of transformation of indolent disease to DLBCL
Current use of systemic corticosteroids greater than (>) 20 mg prednisone per day (or equivalent); or prior anti-cancer therapy to include: radioimmunoconjugate within 12 weeks; mAb or antibody-drug conjugate within 4 weeks; or radiotherapy/chemotherapy/hormone therapy/targeted small-molecule therapy within 2 weeks prior to Day 1 of Cycle 1
Central nervous system (CNS) disease
Active infection
Actual or potential cytochrome P450 (CYP) 3A interactions including: requirement for warfarin; use of strong and moderate CYP3A inhibitors or inducers within 7 days prior to first dose of venetoclax; or consumption of grapefruit, Seville oranges, or star fruit within 3 days prior to first dose of venetoclax
Positive for human immunodeficiency virus (HIV) or hepatitis B or C
Receipt of a live virus vaccine within 28 days prior to Day 1 of Cycle 1
Poor hematologic, renal, or hepatic function
Pregnant or lactating women
Life expectancy <3 months