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 Act of 1934

Date of Report (Date of earliest event reported): March 14, 2013

GARMIN LTD.

(Exact name of registrant as specified in its charter)

Mühlentalstrasse 2

8200 Schaffhausen

Switzerland

(Address of principal executive offices)

Registrant’s telephone number, including area code: +41 52 630 1600

(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 (see General Instruction A.2. below):

     ¨     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

     ¨     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

     ¨     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

     ¨     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 1.01. Entry into a Material Definitive Agreement

On March 14, 2013, Garmin International, Inc. (“Garmin International”), which is a subsidiary of Garmin Ltd., entered into a Memorandum of Agreement (the “Agreement”) with Bombardier, Inc. (“Bombardier”).

Garmin International is the supplier of the avionics system for the Lear 70 and Lear 75 aircraft currently in development for Learjet, Inc., which is a subsidiary of Bombardier (the “Program”). In order to assist Bombardier in connection with delayed cash flows from the Program partially related to the certification of avionics for the Program exceeding the planned delivery date, Garmin International agreed to provide Bombardier a short term, interest free, loan of $173.7 million in cash in seven installments beginning on March 22, 2013 and ending on September 20, 2013 pursuant to the terms and conditions of the Agreement.

Conditional upon Garmin International returning to Learjet a flight test vehicle and delivering specified Garmin software and hardware to Learjet no later than July 11, 2013, Bombardier will repay the loan in five installments beginning on November 1, 2013 and ending on March 7, 2014, provided that the repayment dates will be extended on a day for day basis if the July 11, 2013 milestone date is extended.

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 hereunto duly authorized.