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Securities and Exchange Commission

Washington, D.C. 20549

Form 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 of 15d/16

of the Securities Exchange Act of 1934

May 2016

 AEGON N.V.

Aegonplein 50

2591 TV  THE HAGUE

The Netherlands

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Aegon’s condensed consolidated interim financial statements Q1 2016, dated May 12, 2016, are included as appendix and incorporated herein by reference.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Unaudited

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Amounts for 2015 have been restated for the voluntary changes in accounting policies for deferred cost of reinsurance and insurance accounting in the UK. Refer to note 2.1 Voluntary changes in accounting policies for details about these changes.

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Amounts for 2015 have been restated for the voluntary changes in accounting policies for deferred cost of reinsurance and insurance accounting in the UK. Refer to note 2.1 Voluntary changes in accounting policies for details about these changes.

Unaudited

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Amounts for 2015 have been restated for the voluntary changes in accounting policies for deferred cost of reinsurance and insurance accounting in the UK. Refer to note 2.1 Voluntary changes in accounting policies for details about these changes.

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Amounts for 2015 have been restated for the voluntary changes in accounting policies for deferred cost of reinsurance and insurance accounting in the UK. Refer to note 2.1 Voluntary changes in accounting policies for details about these changes.

Unaudited

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Notes to the condensed consolidated interim financial statements

Amounts in EUR millions, unless otherwise stated

Aegon N.V., incorporated and domiciled in the Netherlands, is a public limited liability company organized under Dutch law and recorded in the Commercial Register of The Hague under number 27076669 and with its registered address at Aegonplein 50, 2591 TV, The Hague, the Netherlands. Aegon N.V. serves as the holding company for the Aegon Group and has listings of its common shares in Amsterdam and New York.

Aegon N.V. (or ‘the Company’) and its consolidated subsidiaries (‘Aegon’ or ‘the Group’) have life insurance and pensions operations in over twenty five countries in the Americas, Europe and Asia and are also active in savings and asset management operations, accident and health insurance, general insurance and to a limited extent banking operations. Its headquarters are located in The Hague, the Netherlands. The Group employs close to 30,000 people worldwide.

1. Basis of presentation

The condensed consolidated interim financial statements as at, and for the period ended, March 31, 2016, have been prepared in accordance with IAS 34 ‘Interim Financial Reporting’, as adopted by the European Union (hereafter ‘IFRS’). They do not include all of the information required for a full set of financial statements prepared in accordance with IFRS and should therefore be read together with the 2015 consolidated financial statements of Aegon N.V. as included in Aegon’s Annual Report for 2015 and the disclosures provided in note 2.1 of this report which disclose the impact of voluntary changes in accounting policies that were made by Aegon effective January 1, 2016. Aegon’s Annual Report for 2015 is available on its website (aegon.com).

The condensed consolidated interim financial statements have been prepared in accordance with the historical cost convention as modified by the revaluation of investment properties and those financial instruments (including derivatives) and financial liabilities that have been measured at fair value.

The condensed consolidated interim financial statements as at, and for the period ended, March 31, 2016, were approved by the Executive Board on May 11, 2016.

The condensed consolidated interim financial statements are presented in euro (EUR) and all values are rounded to the nearest million unless otherwise stated. The consequence is that the rounded amounts may not add up to the rounded total in all cases.

The published figures in these condensed consolidated interim financial statements are unaudited.

2. Significant accounting policies

All accounting policies and methods of computation applied in the condensed consolidated interim financial statements are the same as those applied in the 2015 consolidated financial statements, except for the newly applied accounting policies as described in note 2.1.

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New IFRS accounting standards effective

The following standards, interpretations, amendments to standards and interpretations became effective in 2016:

None of these revised standards and interpretations had a significant effect on the condensed consolidated interim financial statements as at and for the period ended March 31, 2016.

For a complete overview of IFRS standards, published before January 1, 2016, that will be applied in future years, and were not early adopted by the Group, please refer to Aegon’s Annual Report for 2015.

Taxes

Taxes on income for the three month period, ended March 31, 2016, are calculated using the tax rate that would be applicable to total annual earnings.

Judgments and critical accounting estimates

Preparing the condensed consolidated interim financial statements requires management to make judgments, estimates and assumptions, including the likelihood, timing or amount of future transactions or events, that affect the application of accounting policies and the reported amounts of assets and liabilities, income and expense. Actual results may differ from the estimates made.

In preparing the condensed consolidated interim financial statements, significant judgments made by management in applying the Group’s accounting policies and the key sources of estimating uncertainty were not significantly different than those that were applied to the consolidated financial statements as at and for the year ended December 31, 2015.

Exchange rates

Assets and liabilities are translated at the closing rates on the balance sheet date. Income, expenses and capital transactions (such as dividends) are translated at average exchange rates or at the prevailing rates on the transaction date, if more appropriate. The following exchange rates are applied for the condensed consolidated interim financial statements:

Closing exchange rates

Weighted average exchange rates

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2.1 Voluntary changes in accounting policies

On January 13, 2016, Aegon provided an update on its strategic plans at its Analyst & Investor Conference. Following this update Aegon adopted voluntary changes in accounting policies, effective January 1, 2016, which are applied retrospectively for all periods presented. Firstly, Aegon adopted a group-wide accounting policy for reinsurance transactions that are entered into as part of a plan to exit a business. Also, Aegon made two voluntary accounting policy changes that better reflect its business strategy after restructuring in the United Kingdom. The changes in the United Kingdom do not impact other reporting units within Aegon as these are changes specific to Aegon UK. However, these changes do increase alignment with other reporting units within Aegon. Finally Aegon changed its segment reporting.

In the paragraphs below, details are provided for the changes in accounting policies including the impact on shareholders equity and net income. The changes in segment reporting are explained in note 3.

Accounting related to certain reinsurance transactions

Aegon adopted one single group-wide accounting policy for reinsurance transactions that are entered into as part of a plan to exit a business. The previous accounting policy recorded a deferred cost of reinsurance which was subsequently amortized. Under the new accounting policy, when the company enters into a reinsurance contract as part of a plan to exit a business, an immediate gain or loss will be recognized in the income statement.

For purposes of this accounting policy, a business is defined as “designated insurance liabilities to be disposed of through reinsurance transactions”. The insurance liabilities are designated according to their homogenous risk profiles, possible examples include but are not limited to geographical area, product type, distribution channel, policyholder profiles, and policy form or riders.

Insurance accounting for business in United Kingdom

In January 2016, Aegon announced the restructuring of its business and operations in the UK. This involves splitting the Aegon UK business into three components: the annuity business, the traditional pension book and the new digital solutions platform. By extracting the digital solutions platform from the rest of the business, management aims to ensure the focus and separate culture required to successfully build a viable and sustainably growing business over the longer term.

Aegon adopts two voluntary accounting policy changes that better reflect its business strategy after restructuring in the United Kingdom, only affecting Aegon UK. The changes involve the aggregation level at which the liability adequacy test is carried out and the definition of when a substantially modified contract will be derecognized.

Level of aggregation

The previous accounting policy for the level of aggregation for the liability adequacy test in the United Kingdom was on a geographical basis, therefore the total Aegon UK book is considered as one population. After the announced restructuring, Aegon’s business in the United Kingdom has been split into different portfolios that are managed independently from one another. Management is of the opinion that the liability adequacy test should be disaggregated to a portfolio level to reflect this change in strategy. This change in the definition of portfolio for Aegon UK will better align with other reporting units in the Group where insurance contracts are grouped consistent with the Company’s manner of acquiring, servicing and measuring the profitability of its insurance contracts.

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Substantial modification

The previous accounting policy for Aegon’s business in the United Kingdom is to derecognize insurance contracts when legal extinguishment occurs. As the annuity business, the traditional pension book and the new digital solutions platform will be managed separately post-restructuring, Aegon has decided to change its accounting policy for Aegon UK to one that applies criteria from IAS 39 contract modification. Under these criteria a change should be significant enough to be considered an extinguishment of the existing contract and the issuance of a new contract. Aegon considers that this change in accounting policy is preferred as introducing a more sophisticated approach to contract modification is consistent with how the business will be managed post-restructuring. Furthermore, it will provide the user with information that is more relevant and that reliably reflects the economic substance of our transactions with our upgraded policyholders, as required by IFRS 4 and IAS 8, in relation to the nature of contract modifications.

Details of the impact of the adjustments on previous periods are provided in the following tables: