UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

November 15, 2012

Date of Report (Date of earliest event reported)

ResMed Inc.

(Exact Name of Registrant as Specified in Charter)

9001 Spectrum Center Boulevard

San Diego, California 92123

(Address of Principal Executive Offices) (Zip Code)

(858) 836-5000

(Registrant’s telephone number, including area code)

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 5.02(e). Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

ResMed Inc. 2009 Employee Stock Purchase Plan

On November 15, 2012, at the annual meeting of our stockholders, our stockholders approved an amendment to the ResMed Inc. 2009 Employee Stock Purchase Plan (the “Plan”), which increased the number of shares of common stock that may be issued or transferred pursuant to awards under the Plan by 2,000,000 shares, from 2,200,000 shares to 4,200,000 shares.

The amendment to the Plan was filed as Appendix A to our 2012 Proxy Statement filed with the Securities and Exchange Commission on October 4, 2012, and its terms are incorporated here by reference.

Performance-Based Long-Term Equity Incentive Awards

On November 15, 2012, the Compensation Committee of our Board of Directors (the “Committee”) modified our long-term equity incentive program for senior management by adding performance-based restricted stock units (“PSUs”) to the annual award mix. The PSUs will be earned based on our relative Total Stockholder Return (“TSR”) over a three-year performance period beginning November 15, 2012, as more fully described below. The Committee determined that for the equity awards granted November 15, 2012, 50% of the annual long term equity grant value will be in the form of PSUs, with the remaining 50% of equity grant value in the form of options, or our existing restricted stock units, which are earned based on our annual net operating profit performance (“RSUs”), or a 50/50 blend of RSUs and options, at the election of the participant. Previously, senior management received RSUs or options (or a 50/50 blend of both), at the participant’s election.

The PSUs entitle each participant to earn a number of shares of our common stock ranging from 40% to 200% of the target number of PSUs granted (for each executive, the “Target PSUs”), based on our TSR relative to the TSR of the 37 companies in the Dow Jones U.S. Medical Devices Index, including ResMed (“Relative TSR”), over the three-year performance period beginning November 15, 2012 (the “Performance Period”) as set forth below and subject to the executive’s continued employment through the Committee’s certification of performance following the end of the performance period. Linear interpolation will be used to calculate actual awards for performance between the percentiles indicated below. Actual PSU awards are capped, however, at 100% of Target PSUs if ResMed’s absolute TSR for the Performance Period is negative. No dividends are paid or accrued on the PSUs.

The number of Target PSUs granted on November 15, 2012 are set forth below.

Target PSUs Granted

Certain Terminations of Employment. Subject to the change-in-control provisions below, in the event a participant’s service is terminated without cause or by the participant for good reason (each, as defined in the award agreement) during the Performance Period, the Performance Period will be truncated for this participant on the date of termination and the participant will earn a prorated portion of the PSUs, based on Relative TSR performance through the date of termination and actual time worked by the participant. In the event that a participant dies or becomes disabled during the Performance Period, 100% of the participant’s Target PSUs will fully vest and be deemed to be earned as of immediately before the death or disability. In the event of any other terminations of service, unearned PSUs will be forfeited by the participant.

Change-in-Control. If a change-in-control (as defined in the award agreement) occurs during the Performance Period, the PSUs will be deemed to performance-vest and be earned based on our Relative TSR through the date of the change-in-control.

Modification of Terms of RSU Awards and Options

On November 15, 2012, the Committee also approved new vesting terms for the RSUs and options granted to provide for vesting in three (previously four) equal annual installments following the date of grant. In addition, in the event of a participant’s disability (as defined) 100% of the RSUs and options will immediately vest and be earned. The acceleration upon disability provisions apply to all outstanding RSUs and options, as well as those granted on November 15, 2012 and in the future.

Item 5.07. Submission of Matters to a Vote of Security Holders.

On November 15, 2012, at our annual meeting of stockholders, our stockholders (i) elected three directors to our board of directors; (ii) approved the compensation of our named executive officers; (iii) approved the amendment to the ResMed Inc. 2009 Employee Stock Purchase Plan; and (iv) ratified the selection of KPMG LLP as our independent auditors for the fiscal year ending June 30, 2013, as more fully described below.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURES

We have authorized the person whose signature appears below to sign this report on our behalf, in accordance with the Securities Exchange Act of 1934.

EXHIBIT INDEX