Inclusion Criteria:

          -  Centrally reviewed CD20-positive follicular lymphoma grade 1/2 based on WHO
             classification (2016)

          -  Untreated (radiation-, chemo- or immunotherapy) nodal lymphoma (including involvement
             of Waldeyer´s ring)

          -  Age: ≥18 years

          -  ECOG: 0-2

          -  Stage: clinical stage I or II (Ann Arbor classification)

          -  Risk profile: Largest diameter of the lymphoma * 7 cm (sectional images)

          -  Written informed consent and willingness to cooperate during the course of the trial

          -  Adequate hematologic function (unless abnormalities are related to NHL), defined as
             follows: Hemoglobin ≥ 9.0 g/dL; absolute neutrophil count ≥ 1.5 × 109/L, Platelet
             count ≥ 75 × 109/L

          -  Capability to understand the intention and the consequences of the clinical trial

          -  Adequate contraception for men and women of child-bearing age during therapy and 18
             months thereafter

          -  Patients with non-active hepatitis B infection (HBsAg neg/HBcAB pos/HBV DNA neg) under
             1-year require prophylactic anti-viral therapy (e.g. Entecavir®) possible (see also
             5.6. Prior and Concomitant Disease)

        Exclusion Criteria:

          -  Extra nodal manifestation

          -  Secondary cancer in the patient's medical history (exclusion: basalioma, spinalioma,
             melanoma in situ, bladder cancer T1a, non-metastasized solid tumor in constant
             remission, which was diagnosed >3 years ago

          -  Concomitant diseases: congenital or acquired immune-deficiency syndromes, active
             infections including viral hepatitis (serology positive for HBsAg or HBcAb in
             combination positive HBV DNA), uncontrolled concomitant diseases including significant
             cardiovascular or pulmonary disease (see also 5.6. Prior and Concomitant Disease)

          -  Severe psychiatric disease

          -  Pregnancy / lactation

          -  Known hypersensitivity against Gazyvaro (Obinutuzumab) or drugs with similar chemical
             structure or any other additive of the pharmaceutical formula of the study drug

          -  Participation in another interventional trial or follow-up period of a competing trial
             which can influence the results of this current trial

          -  Creatinine > 1.5 times the upper limit of normal (ULN) (unless creatinine clearance
             normal), or calculated creatinine clearance < 40 mL/min

          -  AST or ALT > 2.5 × ULN

          -  Total bilirubin ≥ 1.5 × ULN

          -  INR > 1.5 × ULN

          -  PTT or aPTT > 1.5 × the ULN