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Inclusion Criteria:

* Participant must have newly diagnosed histologically or cytologically confirmed, locally advanced or metastatic non-small cell lung cancer (NSCLC) that is treatment naive and not amenable to curative therapy including surgical resection or chemoradiation
* The tumor harbors exon 19 deletions (Exon 19del) or Exon 21 L858R substitution, as detected by an food and drug administration (FDA)-approved or other validated test in a clinical laboratory improvement amendments (CLIA) certified laboratory (sites in the United states \[US\]) or an accredited local laboratory (sites outside of the US) in accordance with site standard of care
* Mandatory submission of unstained tissue from tumor (in a quantity sufficient to allow for central analysis of EGFR mutation status and blood (for circulating tumor deoxyribonucleic acid \[ctDNA\], digital droplet polymerase chain reaction \[ddPCR\], and pharmacogenomic analysis)
* Any toxicities from prior anticancer therapy must have resolved to common terminology criteria for adverse events (CTCAE) Grade 1 or baseline level
* Participant must have at least 1 measurable lesion, according to response evaluation criteria in solid tumors (RECIST) v1.1 that has not been previously irradiated. Measurable lesions should not have been biopsied during screening, but if only 1 non-irradiated measurable lesion exists, it may undergo a diagnostic biopsy and be acceptable as a target lesion, provided the baseline tumor assessment scans are performed at least 14 days after the biopsy

Exclusion Criteria:

* Participant has received any prior systemic treatment at any time for locally advanced Stage III or metastatic Stage IV disease (adjuvant or neoadjuvant therapy for Stage I or II disease is allowed, if administered more than 12 months prior to the development of locally advanced or metastatic disease)
* Participant has an active or past medical history of leptomeningeal disease
* Participant with untreated spinal cord compression. A participant that has been definitively treated with surgery or radiation and has a stable neurological status for at least 2 weeks prior to randomization is eligible provided they are off corticosteroid treatment or receiving low-dose corticosteroid treatment less than or equal to (\<=) 10 milligrams per day (mg/day) prednisone or equivalent
* Participant has an active or past medical history of interstitial lung disease (ILD)/pneumonitis, including drug-induced or radiation ILD/pneumonitis
* Participant has known allergy, hypersensitivity, or intolerance to the excipients used in formulation of amivantamab, lazertinib, or osimertinib, or any contraindication to the use of osimertinib
* Participant has symptomatic brain metastases. A participant with asymptomatic or previously treated and stable brain metastases may participate in this study

• Goodyear, Arizona, United States
• Yuma, Arizona, United States
• Long Beach, California, United States
• Orange, California, United States
• Lone Tree, Colorado, United States
• Jacksonville, Florida, United States
• Athens, Georgia, United States
• Metairie, Louisiana, United States
• Columbia, Maryland, United States
• Detroit, Michigan, United States
• Edina, Minnesota, United States
• Rochester, Minnesota, United States
• St Louis, Missouri, United States
• East Brunswick, New Jersey, United States
• Eugene, Oregon, United States
• Pittsburgh, Pennsylvania, United States
• Nashville, Tennessee, United States
• Austin, Texas, United States
• Houston, Texas, United States
• Fairfax, Virginia, United States
• Buenos Aires, Argentina
• Buenos Aires, Argentina
• Córdoba, Argentina
• La Rioja, Argentina
• Viedma, Argentina
• Bedford Park, Australia
• Heidelberg, Australia
• Malvern, Australia
• Murdoch, Australia
• Nedlands, Australia
• + 239 more on CT.gov